Fix broken tag handling in QRCodeSetupPayloadParser.

[bzbarsky-apple]

The only reason this worked in any way is that TLV::IsProfileTag()
tests true for small integers, so the VerifyOrReturnError was a no-op,
even though we were testing IsContextTag() and IsProfileTag() on the
tag number, not the tag.

Per spec, only context tags are allowed here, so just allow those.

Fixes #10188

Problem

Tag numbers being treated as tags.

Change overview

Fix that, so we can try to make TLV::Tag not be an integer anymore.

Testing

Not sure how to exercise this code...

[github-actions]

PR #13201: Size comparison from f9ce4be to 065db81

Decreases (1 build for linux)

platform	target	config	section	f9ce4be	065db81	change	% change
linux	chip-tool-ipv6only	arm64	(read only)	6999268	6999236	-32	-0.0
			.text	5921604	5921572	-32	-0.0

Full report (31 builds for efr32, esp32, k32w, linux, mbed, nrfconnect, p6, qpg, telink)

platform	target	config	section	f9ce4be	065db81	change	% change
efr32	lighting-app	BRD4161A	(read only)	829152	829152	0	0.0
			(read/write)	127104	127104	0	0.0
			.bss	125224	125224	0	0.0
			.data	1876	1876	0	0.0
			.text	829144	829144	0	0.0
		BRD4161A+rpc	(read only)	816796	816796	0	0.0
			(read/write)	143768	143768	0	0.0
			.bss	141792	141792	0	0.0
			.data	1976	1976	0	0.0
			.text	816788	816788	0	0.0
	window-app	BRD4161A	(read only)	802616	802616	0	0.0
			(read/write)	126040	126040	0	0.0
			.bss	124208	124208	0	0.0
			.data	1832	1832	0	0.0
			.text	802608	802608	0	0.0
esp32	all-clusters-app	c3devkit	(read only)	884820	884820	0	0.0
			(read/write)	1312466	1312466	0	0.0
			.dram0.bss	69104	69104	0	0.0
			.dram0.data	14220	14220	0	0.0
			.flash.rodata	176088	176088	0	0.0
			.flash.text	884820	884820	0	0.0
			.iram0.text	62254	62254	0	0.0
		m5stack	(read only)	945571	945571	0	0.0
			(read/write)	441592	441592	0	0.0
			.dram0.bss	73608	73608	0	0.0
			.dram0.data	34056	34056	0	0.0
			.flash.rodata	202920	202920	0	0.0
			.flash.text	940187	940187	0	0.0
			.iram0.text	122671	122671	0	0.0
k32w	light	k32w061+release	(read/write)	647512	647512	0	0.0
			.bss	76232	76232	0	0.0
			.data	1904	1904	0	0.0
			.text	563576	563576	0	0.0
	lock	k32w061+release	(read/write)	632224	632224	0	0.0
			.bss	75944	75944	0	0.0
			.data	1860	1860	0	0.0
			.text	548620	548620	0	0.0
linux	chip-tool-ipv6only	arm64	(read only)	6999268	6999236	-32	-0.0
			(read/write)	325953	325953	0	0.0
			.bss	54305	54305	0	0.0
			.data	1096	1096	0	0.0
			.data.rel.ro	210128	210128	0	0.0
			.dynamic	560	560	0	0.0
			.got	56728	56728	0	0.0
			.init	24	24	0	0.0
			.init_array	168	168	0	0.0
			.rodata	384220	384220	0	0.0
			.text	5921604	5921572	-32	-0.0
	thermostat-no-ble	arm64	(read only)	2013428	2013428	0	0.0
			(read/write)	144033	144033	0	0.0
			.bss	64065	64065	0	0.0
			.data	880	880	0	0.0
			.data.rel.ro	72272	72272	0	0.0
			.dynamic	560	560	0	0.0
			.got	3888	3888	0	0.0
			.init	24	24	0	0.0
			.init_array	296	296	0	0.0
			.rodata	128820	128820	0	0.0
			.text	1672016	1672016	0	0.0
mbed	all-clusters-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2341320	2341320	0	0.0
			.bss	188380	188380	0	0.0
			.data	5280	5280	0	0.0
			.text	1303896	1303896	0	0.0
	lighting-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2329120	2329120	0	0.0
			.bss	180656	180656	0	0.0
			.data	5552	5552	0	0.0
			.text	1291720	1291720	0	0.0
	lock-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2302152	2302152	0	0.0
			.bss	179704	179704	0	0.0
			.data	5544	5544	0	0.0
			.text	1264752	1264752	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	4368	4368	0	0.0
			.text	103392	103392	0	0.0
	shell	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2053840	2053840	0	0.0
			.bss	156972	156972	0	0.0
			.data	4864	4864	0	0.0
			.text	1016440	1016440	0	0.0
nrfconnect	lighting-app	nrf52840dk_nrf52840	(read/write)	934663	934663	0	0.0
			bss	118148	118148	0	0.0
			rodata	107908	107908	0	0.0
			text	631024	631024	0	0.0
		nrf52840dk_nrf52840+rpc	(read/write)	921015	921015	0	0.0
			bss	115192	115192	0	0.0
			rodata	101324	101324	0	0.0
			text	626336	626336	0	0.0
		nrf5340dk_nrf5340_cpuapp	(read/write)	858394	858394	0	0.0
			bss	116432	116432	0	0.0
			rodata	102832	102832	0	0.0
			text	558468	558468	0	0.0
	lock-app	nrf52840dk_nrf52840	(read/write)	906775	906775	0	0.0
			bss	117336	117336	0	0.0
			rodata	103212	103212	0	0.0
			text	608852	608852	0	0.0
		nrf5340dk_nrf5340_cpuapp	(read/write)	830690	830690	0	0.0
			bss	115648	115648	0	0.0
			rodata	98176	98176	0	0.0
			text	536332	536332	0	0.0
	pigweed-app	nrf52840dk_nrf52840	(read/write)	542351	542351	0	0.0
			bss	52588	52588	0	0.0
			rodata	50668	50668	0	0.0
			text	376892	376892	0	0.0
	pump-app	nrf52840dk_nrf52840	(read/write)	908071	908071	0	0.0
			bss	117096	117096	0	0.0
			rodata	103428	103428	0	0.0
			text	610088	610088	0	0.0
	pump-controller-app	nrf52840dk_nrf52840	(read/write)	904887	904887	0	0.0
			bss	117124	117124	0	0.0
			rodata	102684	102684	0	0.0
			text	607600	607600	0	0.0
	shell	nrf52840dk_nrf52840	(read/write)	796079	796079	0	0.0
			bss	109464	109464	0	0.0
			rodata	78096	78096	0	0.0
			text	532048	532048	0	0.0
		nrf5340dk_nrf5340_cpuapp	(read/write)	708710	708710	0	0.0
			bss	107352	107352	0	0.0
			rodata	72396	72396	0	0.0
			text	449544	449544	0	0.0
p6	all-clusters-app	default	(read/write)	2393848	2393848	0	0.0
			.bss	116580	116580	0	0.0
			.data	2552	2552	0	0.0
			.text	1352112	1352112	0	0.0
	light-app	default	(read/write)	2323808	2323808	0	0.0
			.bss	105904	105904	0	0.0
			.data	2384	2384	0	0.0
			.text	1282072	1282072	0	0.0
	lock-app	default	(read/write)	2296032	2296032	0	0.0
			.bss	104784	104784	0	0.0
			.data	2336	2336	0	0.0
			.text	1254296	1254296	0	0.0
qpg	lighting-app	qpg6105+debug	(read only)	531120	531120	0	0.0
			(read/write)	146936	146936	0	0.0
			.bss	86704	86704	0	0.0
			.data	1004	1004	0	0.0
			.text	525800	525800	0	0.0
	lock-app	qpg6105+debug	(read only)	502812	502812	0	0.0
			(read/write)	146940	146940	0	0.0
			.bss	85840	85840	0	0.0
			.data	952	952	0	0.0
			.text	497492	497492	0	0.0
	persistent-storage-app	qpg6105+debug	(read only)	106448	106448	0	0.0
			(read/write)	146938	146938	0	0.0
			.bss	36146	36146	0	0.0
			.data	288	288	0	0.0
			.text	101128	101128	0	0.0
telink	lighting-app	tlsr9518adk80d	(read/write)	830770	830770	0	0.0
			bss	86808	86808	0	0.0
			noinit	37160	37160	0	0.0
			text	579380	579380	0	0.0