Setup keep_trailing_newline=True in python jinja templates

[andy31415]

We codegen C++ headers and sources and for headers, the final newline can be important.

This adds keep_trailing_newline to jinja codegen.

I also made it so that the unit tests for codegen can easily update their outputs and re-generated all files.

[github-actions]

PR #23235: Size comparison from 11606ea to c4d56d3

Decreases (3 builds for bl702, qpg)

platform	target	config	section	11606ea	c4d56d3	change	% change
bl702	lighting-app	bl702	(read/write)	1188691	1188675	-16	-0.0
			.debug_info	37905413	37905412	-1	-0.0
			.text	957058	957056	-2	-0.0
		bl702+rpc	.debug_info	41812027	41812026	-1	-0.0
			.text	1030504	1030502	-2	-0.0
qpg	lock-app	qpg6105+debug	(read/write)	1113712	1113704	-8	-0.0
			.text	560808	560800	-8	-0.0

Full report (6 builds for bl702, linux, qpg)

platform	target	config	section	11606ea	c4d56d3	change	% change
bl702	lighting-app	bl702		0	0	0	0.0
			(read only)	3262	3262	0	0.0
			(read/write)	1188691	1188675	-16	-0.0
			.bleromro	6296	6296	0	0.0
			.bleromrw	124	124	0	0.0
			.boot2	688	688	0	0.0
			.bss	67102	67102	0	0.0
			.bss_psram	29696	29696	0	0.0
			.comment	48	48	0	0.0
			.data	4272	4272	0	0.0
			.debug_abbrev	1506865	1506865	0	0.0
			.debug_aranges	133136	133136	0	0.0
			.debug_frame	486600	486600	0	0.0
			.debug_info	37905413	37905412	-1	-0.0
			.debug_line	5256822	5256822	0	0.0
			.debug_loc	3367145	3367145	0	0.0
			.debug_ranges	359376	359376	0	0.0
			.debug_str	3457811	3457811	0	0.0
			.hbn	509	509	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	116744	116744	0	0.0
			.rsvd	3188	3188	0	0.0
			.shstrtab	293	293	0	0.0
			.stack	2048	2048	0	0.0
			.strtab	565071	565071	0	0.0
			.symtab	171664	171664	0	0.0
			.tcm_data	36	36	0	0.0
			.tcmcode	3262	3262	0	0.0
			.text	957058	957056	-2	-0.0
		bl702+rpc		0	0	0	0.0
			(read only)	3262	3262	0	0.0
			(read/write)	1284355	1284355	0	0.0
			.bleromro	6296	6296	0	0.0
			.bleromrw	124	124	0	0.0
			.boot2	688	688	0	0.0
			.bss	75150	75150	0	0.0
			.bss_psram	29936	29936	0	0.0
			.comment	48	48	0	0.0
			.data	4800	4800	0	0.0
			.debug_abbrev	1644410	1644410	0	0.0
			.debug_aranges	140640	140640	0	0.0
			.debug_frame	511972	511972	0	0.0
			.debug_info	41812027	41812026	-1	-0.0
			.debug_line	5631353	5631353	0	0.0
			.debug_loc	3559792	3559792	0	0.0
			.debug_ranges	381832	381832	0	0.0
			.debug_str	3853711	3853711	0	0.0
			.hbn	509	509	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	130136	130136	0	0.0
			.rsvd	3188	3188	0	0.0
			.shstrtab	293	293	0	0.0
			.stack	2048	2048	0	0.0
			.strtab	624244	624244	0	0.0
			.symtab	189472	189472	0	0.0
			.tcm_data	36	36	0	0.0
			.tcmcode	3262	3262	0	0.0
			.text	1030504	1030502	-2	-0.0
linux	chip-tool-ipv6only	arm64	(read only)	10429476	10429476	0	0.0
			(read/write)	706353	706353	0	0.0
			.bss	33953	33953	0	0.0
			.data	2768	2768	0	0.0
			.data.rel.ro	650632	650632	0	0.0
			.dynamic	560	560	0	0.0
			.got	13896	13896	0	0.0
			.init	24	24	0	0.0
			.init_array	208	208	0	0.0
			.rodata	518132	518132	0	0.0
			.text	8255780	8255780	0	0.0
	thermostat-no-ble	arm64	(read only)	2390524	2390524	0	0.0
			(read/write)	143633	143633	0	0.0
			.bss	55377	55377	0	0.0
			.data	1816	1816	0	0.0
			.data.rel.ro	77256	77256	0	0.0
			.dynamic	560	560	0	0.0
			.got	5176	5176	0	0.0
			.init	24	24	0	0.0
			.init_array	440	440	0	0.0
			.rodata	144436	144436	0	0.0
			.text	2003184	2003184	0	0.0
qpg	lighting-app	qpg6105+debug	(read/write)	1148632	1148632	0	0.0
			.bss	110556	110556	0	0.0
			.data	832	832	0	0.0
			.text	595732	595732	0	0.0
	lock-app	qpg6105+debug	(read/write)	1113712	1113704	-8	-0.0
			.bss	106372	106372	0	0.0
			.data	836	836	0	0.0
			.text	560808	560800	-8	-0.0