[nrfconnect] Add to flake8 in workflow and fix python files (part #25193)

[DamMicSzm]

This pull request is a part of #25193 ( part fix python files in nrfconnect )

Problem

Python files need prevent things like syntax errors, typos, bad style, etc... it saves time for reviewing your code. Many python files needed bug fixes.

Changes

Fix all python files in nrfconnect where linter find problem. Adding nrfconnect to check with flake8.

Testing

CI will test and maybe some another manual testing

[github-actions]

PR #25277: Size comparison from 7e728bc to 1c70716

Decreases (1 build for cc32xx)

platform	target	config	section	7e728bc	1c70716	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL	.debug_info	20249763	20249762	-1	-0.0

Full report (2 builds for cc32xx, mbed)

platform	target	config	section	7e728bc	1c70716	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	642569	642569	0	0.0
			(read/write)	203664	203664	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197064	197064	0	0.0
			.comment	194	194	0	0.0
			.data	1480	1480	0	0.0
			.debug_abbrev	930138	930138	0	0.0
			.debug_aranges	87272	87272	0	0.0
			.debug_frame	299764	299764	0	0.0
			.debug_info	20249763	20249762	-1	-0.0
			.debug_line	2655140	2655140	0	0.0
			.debug_loc	2795460	2795460	0	0.0
			.debug_ranges	281592	281592	0	0.0
			.debug_str	3018033	3018033	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	105817	105817	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	377761	377761	0	0.0
			.symtab	256256	256256	0	0.0
			.text	534628	534628	0	0.0
mbed	lock-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2466856	2466856	0	0.0
			.bss	215780	215780	0	0.0
			.data	5880	5880	0	0.0
			.text	1429500	1429500	0	0.0

[github-actions]

PR #25277: Size comparison from 61cf6f2 to 0ab347b

Full report (2 builds for cc32xx, mbed)

platform	target	config	section	61cf6f2	0ab347b	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	642681	642681	0	0.0
			(read/write)	203672	203672	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197072	197072	0	0.0
			.comment	194	194	0	0.0
			.data	1480	1480	0	0.0
			.debug_abbrev	930133	930133	0	0.0
			.debug_aranges	87304	87304	0	0.0
			.debug_frame	299872	299872	0	0.0
			.debug_info	20257009	20257009	0	0.0
			.debug_line	2656183	2656183	0	0.0
			.debug_loc	2797535	2797535	0	0.0
			.debug_ranges	281792	281792	0	0.0
			.debug_str	3023459	3023459	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	105769	105769	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	377825	377825	0	0.0
			.symtab	256256	256256	0	0.0
			.text	534788	534788	0	0.0
mbed	lock-app	CY8CPROTO_062_4343W+release	(read only)	6224	6224	0	0.0
			(read/write)	2467168	2467168	0	0.0
			.bss	215788	215788	0	0.0
			.data	5880	5880	0	0.0
			.text	1429812	1429812	0	0.0

[github-actions]

PR #25277: Size comparison from eff5773 to 3a6a869

Full report (1 build for cc32xx)

platform	target	config	section	eff5773	3a6a869	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	643465	643465	0	0.0
			(read/write)	203688	203688	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197088	197088	0	0.0
			.comment	194	194	0	0.0
			.data	1480	1480	0	0.0
			.debug_abbrev	930167	930167	0	0.0
			.debug_aranges	87336	87336	0	0.0
			.debug_frame	300024	300024	0	0.0
			.debug_info	20262893	20262893	0	0.0
			.debug_line	2657207	2657207	0	0.0
			.debug_loc	2799993	2799993	0	0.0
			.debug_ranges	282240	282240	0	0.0
			.debug_str	3023883	3023883	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	105929	105929	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	378514	378514	0	0.0
			.symtab	256560	256560	0	0.0
			.text	535412	535412	0	0.0

[github-actions]

PR #25277: Size comparison from 536a0d9 to 37a6807

Full report (1 build for cc32xx)

platform	target	config	section	536a0d9	37a6807	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	644425	644425	0	0.0
			(read/write)	203688	203688	0	0.0
			.ARM.attributes	44	44	0	0.0
			.ARM.exidx	8	8	0	0.0
			.bss	197088	197088	0	0.0
			.comment	194	194	0	0.0
			.data	1480	1480	0	0.0
			.debug_abbrev	930235	930235	0	0.0
			.debug_aranges	87344	87344	0	0.0
			.debug_frame	300044	300044	0	0.0
			.debug_info	20267387	20267387	0	0.0
			.debug_line	2659771	2659771	0	0.0
			.debug_loc	2802807	2802807	0	0.0
			.debug_ranges	282960	282960	0	0.0
			.debug_str	3024017	3024017	0	0.0
			.ramVecs	780	780	0	0.0
			.resetVecs	64	64	0	0.0
			.rodata	105929	105929	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	378514	378514	0	0.0
			.symtab	256624	256624	0	0.0
			.text	536372	536372	0	0.0