Cache bootstrap step in all CI workflows

[arkq]

Problem

Bootstrap takes ~5-6min to complete and is used in almost all workflows. Caching this step can save ~4-5min (restore takes ~1min).

Changes

• moved all bootstrap configuration files to a dedicated directory (the hash of these files will be used as a cache key)
• added cache step before bootstrap step in workflow files
• use action cache feature for caching PyPi files (this will generate proper cache key - based on requirements content)

Testing

CI will test that in a 2 steps process:

1. PR check should pass during initial check
2. PR check should pass after merging master changes (on second run, cache should be used for bootstrap step)

[github-actions]

PR #24968: Size comparison from 1f81384 to b102b1a

Increases (2 builds for bl602, bl702)

platform	target	config	section	1f81384	b102b1a	change	% change
bl602	lighting-app	bl602+rpc	(read/write)	1392014	1392022	8	0.0
			.text	1054254	1054258	4	0.0
bl702	lighting-app	bl702+rpc	.debug_info	44938489	44938491	2	0.0
			.text	1029628	1029632	4	0.0

Decreases (1 build for qpg)

platform	target	config	section	1f81384	b102b1a	change	% change
qpg	lock-app	qpg6105+debug	(read/write)	1116736	1116728	-8	-0.0
			.text	563832	563824	-8	-0.0

Full report (7 builds for bl602, bl702, cc32xx, qpg)

platform	target	config	section	1f81384	b102b1a	change	% change
bl602	lighting-app	bl602	(read/write)	1346582	1346582	0	0.0
			.bss	94794	94794	0	0.0
			.data	9736	9736	0	0.0
			.text	1023324	1023324	0	0.0
		bl602+rpc	(read/write)	1392014	1392022	8	0.0
			.bss	102842	102842	0	0.0
			.data	10128	10128	0	0.0
			.text	1054254	1054258	4	0.0
bl702	lighting-app	bl702		0	0	0	0.0
			(read only)	3358	3358	0	0.0
			(read/write)	1184651	1184651	0	0.0
			.bleromro	6342	6342	0	0.0
			.bleromrw	124	124	0	0.0
			.boot2	292	292	0	0.0
			.bss	69905	69905	0	0.0
			.bss_psram	30048	30048	0	0.0
			.comment	48	48	0	0.0
			.data	4056	4056	0	0.0
			.debug_abbrev	1550382	1550382	0	0.0
			.debug_aranges	134192	134192	0	0.0
			.debug_frame	491492	491492	0	0.0
			.debug_info	4053630	4053630	0	0.0
			.debug_line	5272965	5272965	0	0.0
			.debug_loc	3409446	3409446	0	0.0
			.debug_ranges	371752	371752	0	0.0
			.debug_str	3558337	3558337	0	0.0
			.hbn	536	536	0	0.0
			.hbn_noinit	260	260	0	0.0
			.init	342	342	0	0.0
			.init_array	144	144	0	0.0
			.psram	0	0	0	0.0
			.riscv.attributes	47	47	0	0.0
			.rodata	107120	107120	0	0.0
			.rsvd	2960	2960	0	0.0
			.sha_ocram	72	72	0	0.0
			.shstrtab	304	304	0	0.0
			.stack	2048	2048	0	0.0
			.strtab	572518	572518	0	0.0
			.symtab	173424	173424	0	0.0
			.tcm_data	36	36	0	0.0
			.tcmcode	3358	3358	0	0.0
			.text	952436	952436	0	0.0
		bl702+rpc		0	0	0	0.0
			(read only)	3358	3358	0	0.0
			(read/write)	1277535	1277535	0	0.0
			.bleromro	6342	6342	0	0.0
			.bleromrw	124	124	0	0.0
			.boot2	292	292	0	0.0
			.bss	77953	77953	0	0.0
			.bss_psram	30304	30304	0	0.0
			.comment	48	48	0	0.0
			.data	4608	4608	0	0.0
			.debug_abbrev	1698796	1698796	0	0.0
			.debug_aranges	142424	142424	0	0.0
			.debug_frame	519236	519236	0	0.0
			.debug_info	44938489	44938491	2	0.0
			.debug_line	5671672	5671672	0	0.0
			.debug_loc	3606205	3606205	0	0.0
			.debug_ranges	395520	395520	0	0.0
			.debug_str	3961701	3961701	0	0.0
			.hbn	536	536	0	0.0
			.hbn_noinit	260	260	0	0.0
			.init	342	342	0	0.0
			.init_array	160	160	0	0.0
			.psram	0	0	0	0.0
			.riscv.attributes	47	47	0	0.0
			.rodata	121696	121696	0	0.0
			.rsvd	2960	2960	0	0.0
			.sha_ocram	72	72	0	0.0
			.shstrtab	304	304	0	0.0
			.stack	2048	2048	0	0.0
			.strtab	633311	633311	0	0.0
			.symtab	191840	191840	0	0.0
			.tcm_data	36	36	0	0.0
			.tcmcode	3358	3358	0	0.0
			.text	1029628	1029632	4	0.0
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	640233	640233	0	0.0
			(read/write)	204084	204084	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197488	197488	0	0.0
			.comment	194	194	0	0.0
			.data	1476	1476	0	0.0
			.debug_abbrev	928439	928439	0	0.0
			.debug_aranges	87352	87352	0	0.0
			.debug_frame	299840	299840	0	0.0
			.debug_info	20194396	20194396	0	0.0
			.debug_line	2649797	2649797	0	0.0
			.debug_loc	2785922	2785922	0	0.0
			.debug_ranges	280720	280720	0	0.0
			.debug_str	3001474	3001474	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	105585	105585	0	0.0
			.shstrtab	232	232	0	0.0
			.stab	204	204	0	0.0
			.stabstr	441	441	0	0.0
			.stack	2048	2048	0	0.0
			.strtab	375840	375840	0	0.0
			.symtab	255856	255856	0	0.0
			.text	532524	532524	0	0.0
qpg	lighting-app	qpg6105+debug	(read/write)	1148688	1148688	0	0.0
			.bss	99876	99876	0	0.0
			.data	848	848	0	0.0
			.text	595788	595788	0	0.0
	lock-app	qpg6105+debug	(read/write)	1116736	1116728	-8	-0.0
			.bss	96396	96396	0	0.0
			.data	860	860	0	0.0
			.text	563832	563824	-8	-0.0