Add target for native unit test execution for nrfconnect in build_examples.py

[andy31415]

Problem

Too many custom scripts for compiling things

Change overview

Adds the target nrf-native-posix-64-tests that builds and runs zephyr native unit tests for nrfconnect
Updated CI workflow to use the build_examples.py script instead of separate script.

Testing

Ran tests locally
Unit tests will run the same thing

[github-actions]

PR #12956: Size comparison from 73776ef to 54ac994

Full report (32 builds for efr32, esp32, k32w, linux, mbed, nrfconnect, p6, qpg, telink)

platform	target	config	section	73776ef	54ac994	change	% change
efr32	lighting-app	BRD4161A	(read only)	815948	815948	0	0.0
			(read/write)	123152	123152	0	0.0
			.bss	121288	121288	0	0.0
			.data	1864	1864	0	0.0
			.text	815940	815940	0	0.0
		BRD4161A+rpc	(read only)	803580	803580	0	0.0
			(read/write)	139828	139828	0	0.0
			.bss	137864	137864	0	0.0
			.data	1964	1964	0	0.0
			.text	803572	803572	0	0.0
	window-app	BRD4161A	(read only)	793008	793008	0	0.0
			(read/write)	122104	122104	0	0.0
			.bss	120272	120272	0	0.0
			.data	1828	1828	0	0.0
			.text	793000	793000	0	0.0
esp32	all-clusters-app	c3devkit	(read only)	857188	857188	0	0.0
			(read/write)	1304450	1304450	0	0.0
			.dram0.bss	64696	64696	0	0.0
			.dram0.data	14164	14164	0	0.0
			.flash.rodata	172544	172544	0	0.0
			.flash.text	857188	857188	0	0.0
			.iram0.text	62076	62076	0	0.0
		m5stack	(read only)	961251	961251	0	0.0
			(read/write)	450260	450260	0	0.0
			.dram0.bss	73984	73984	0	0.0
			.dram0.data	34048	34048	0	0.0
			.flash.rodata	210440	210440	0	0.0
			.flash.text	955867	955867	0	0.0
			.iram0.text	123451	123451	0	0.0
k32w	lighting-app	k32w061+se05x+release	(read/write)	670408	670408	0	0.0
			.bss	73872	73872	0	0.0
			.data	1896	1896	0	0.0
			.text	588840	588840	0	0.0
	lock-app	k32w061+debug	(read/write)	620344	620344	0	0.0
			.bss	72024	72024	0	0.0
			.data	1856	1856	0	0.0
			.text	540664	540664	0	0.0
	shell	k32w061+debug	(read/write)	625712	625712	0	0.0
			.bss	74332	74332	0	0.0
			.data	1836	1836	0	0.0
			.text	543744	543744	0	0.0
linux	chip-tool-ipv6only	arm64	(read only)	6873564	6873564	0	0.0
			(read/write)	319201	319201	0	0.0
			.bss	51921	51921	0	0.0
			.data	1192	1192	0	0.0
			.data.rel.ro	208784	208784	0	0.0
			.dynamic	560	560	0	0.0
			.got	53576	53576	0	0.0
			.init	24	24	0	0.0
			.init_array	176	176	0	0.0
			.rodata	365692	365692	0	0.0
			.text	5826788	5826788	0	0.0
	thermostat-no-ble	arm64	(read only)	1954660	1954660	0	0.0
			(read/write)	137537	137537	0	0.0
			.bss	59537	59537	0	0.0
			.data	832	832	0	0.0
			.data.rel.ro	70600	70600	0	0.0
			.dynamic	560	560	0	0.0
			.got	3680	3680	0	0.0
			.init	24	24	0	0.0
			.init_array	280	280	0	0.0
			.rodata	125796	125796	0	0.0
			.text	1620512	1620512	0	0.0
mbed	all-clusters-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2314032	2314032	0	0.0
			.bss	183964	183964	0	0.0
			.data	5240	5240	0	0.0
			.heap	847240	847240	0	0.0
			.text	1276608	1276608	0	0.0
	lighting-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2309888	2309888	0	0.0
			.bss	175824	175824	0	0.0
			.data	5536	5536	0	0.0
			.heap	855088	855088	0	0.0
			.text	1272488	1272488	0	0.0
	lock-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2283000	2283000	0	0.0
			.bss	174864	174864	0	0.0
			.data	5528	5528	0	0.0
			.heap	856056	856056	0	0.0
			.text	1245600	1245600	0	0.0
	pigweed-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	1140008	1140008	0	0.0
			.bss	11756	11756	0	0.0
			.data	4376	4376	0	0.0
			.heap	1020312	1020312	0	0.0
			.text	103392	103392	0	0.0
	shell	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2053944	2053944	0	0.0
			.bss	156980	156980	0	0.0
			.data	4864	4864	0	0.0
			.heap	874600	874600	0	0.0
			.text	1016544	1016544	0	0.0
nrfconnect	lighting-app	nrf52840dk_nrf52840	(read/write)	907723	907723	0	0.0
			bss	116300	116300	0	0.0
			rodata	102060	102060	0	0.0
			text	613756	613756	0	0.0
		nrf52840dk_nrf52840+rpc	(read/write)	870775	870775	0	0.0
			bss	112648	112648	0	0.0
			rodata	93360	93360	0	0.0
			text	588500	588500	0	0.0
		nrf5340dk_nrf5340_cpuapp	(read/write)	833726	833726	0	0.0
			bss	117672	117672	0	0.0
			rodata	97320	97320	0	0.0
			text	544184	544184	0	0.0
	lock-app	nrf52840dk_nrf52840	(read/write)	880339	880339	0	0.0
			bss	113560	113560	0	0.0
			rodata	98180	98180	0	0.0
			text	593192	593192	0	0.0
		nrf5340dk_nrf5340_cpuapp	(read/write)	806578	806578	0	0.0
			bss	114972	114972	0	0.0
			rodata	93468	93468	0	0.0
			text	523712	523712	0	0.0
	pigweed-app	nrf52840dk_nrf52840	(read/write)	497463	497463	0	0.0
			bss	51820	51820	0	0.0
			rodata	45852	45852	0	0.0
			text	339492	339492	0	0.0
	pump-app	nrf52840dk_nrf52840	(read/write)	885291	885291	0	0.0
			bss	113472	113472	0	0.0
			rodata	99532	99532	0	0.0
			text	596796	596796	0	0.0
	pump-controller-app	nrf52840dk_nrf52840	(read/write)	878515	878515	0	0.0
			bss	113352	113352	0	0.0
			rodata	97668	97668	0	0.0
			text	591992	591992	0	0.0
	shell	nrf52840dk_nrf52840	(read/write)	782427	782427	0	0.0
			bss	109624	109624	0	0.0
			rodata	74296	74296	0	0.0
			text	523996	523996	0	0.0
		nrf5340dk_nrf5340_cpuapp	(read/write)	697506	697506	0	0.0
			bss	110604	110604	0	0.0
			rodata	68940	68940	0	0.0
			text	444636	444636	0	0.0
p6	all-clusters-app	default	(read/write)	2360976	2360976	0	0.0
			.bss	112164	112164	0	0.0
			.data	2528	2528	0	0.0
			.heap	918648	918648	0	0.0
			.text	1319240	1319240	0	0.0
	light-app	default	(read/write)	2301568	2301568	0	0.0
			.bss	101080	101080	0	0.0
			.data	2368	2368	0	0.0
			.heap	929896	929896	0	0.0
			.text	1259832	1259832	0	0.0
	lock-app	default	(read/write)	2277640	2277640	0	0.0
			.bss	99960	99960	0	0.0
			.data	2328	2328	0	0.0
			.heap	931056	931056	0	0.0
			.text	1235904	1235904	0	0.0
qpg	lighting-app	qpg6100+debug	(read only)	522160	522160	0	0.0
			(read/write)	122332	122332	0	0.0
			.bss	82712	82712	0	0.0
			.data	996	996	0	0.0
			.text	516840	516840	0	0.0
	lock-app	qpg6100+debug	(read only)	496532	496532	0	0.0
			(read/write)	122336	122336	0	0.0
			.bss	81848	81848	0	0.0
			.data	952	952	0	0.0
			.text	491212	491212	0	0.0
	persistent-storage-app	qpg6100+debug	(read only)	108104	108104	0	0.0
			(read/write)	122336	122336	0	0.0
			.bss	36160	36160	0	0.0
			.data	288	288	0	0.0
			.text	102784	102784	0	0.0
telink	lighting-app	tlsr9518adk80d	(read/write)	812262	812262	0	0.0
			bss	82864	82864	0	0.0
			noinit	37160	37160	0	0.0
			text	567218	567218	0	0.0

[andy31415]

fast track: build system change only, has been up for sufficient time for all timezone review, has a few checkmarks already