doc: test and test-only targets do not run linter anymore #3975

Job	Run time
Build slim tarball	2m 5s
x86_64-linux: with shared libraries	19m 54s
aarch64-darwin: with shared libraries	21m 42s
x86_64-darwin: with shared libraries	42m 29s
aarch64-linux: with shared libraries	18m 11s
	1h 44m 21s

Provide feedback