Refactor pipeline management #7266

Job	Run time
GCC build arm64	19m 3s
GCC build arm64 allmodconfig	1m 44s
GCC static -fanalyzer	2m 44s
Clang build x86_64	4m 35s
GCC build i386	15m 33s
GCC build X86_64	19m 26s
GCC build X86_64 with W=1	2m 48s
GCC build X86_64 with W=1 allmodconfig	1m 38s
Sparse check	4m 7s
	1h 11m 38s

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