Reduce priority of factory reset task

[mlepage-google]

Since the task priorities were adjusted for #24099 (and maybe even before?) the factory reset RPC would time out, breaking any test which relies on the RPC successfully completing.

This is because the reset is happening immediately, before whatever is handling the RPC can complete.

Reducing the FreeRTOS task priority just before the reset "fixes" it. (Maybe there's a better fix?)

Tested on Mighty Gecko SiLabs board.

[github-actions]

PR #25598: Size comparison from 99cbba0 to a62713a

Decreases (1 build for cc32xx)

platform	target	config	section	99cbba0	a62713a	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL	.debug_info	20268460	20268459	-1	-0.0

Full report (1 build for cc32xx)

platform	target	config	section	99cbba0	a62713a	change	% change
cc32xx	lock	CC3235SF_LAUNCHXL		0	0	0	0.0
			(read only)	644465	644465	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	930280	930280	0	0.0
			.debug_aranges	87344	87344	0	0.0
			.debug_frame	300048	300048	0	0.0
			.debug_info	20268460	20268459	-1	-0.0
			.debug_line	2659917	2659917	0	0.0
			.debug_loc	2802993	2802993	0	0.0
			.debug_ranges	282936	282936	0	0.0
			.debug_str	3023875	3023875	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	378571	378571	0	0.0
			.symtab	256624	256624	0	0.0
			.text	536412	536412	0	0.0