build: Ignore format checks when downstreaming #370

Job	Run time
code-format	1m 14s
check_vvl	1m 49s
linux (undefined behavior sanitizer, debug)	38m 5s
Ubuntu Backcompat	12m 34s
windows (amd64_x86)	12m 36s
linux (address sanitizer, release, custom_hash_map OFF )	32m 9s
linux (address sanitizer, release, custom_hash_map ON )	32m 56s
linux (thread sanitizer, release, custom_hash_map ON )	23m 33s
mingw	22m 17s
windows (amd64)	1s
	2h 57m 14s

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