feat(mdatagen): add automatic feature gate documentation generation (… #36583

Job	Run time
setup-environment	8s
govulncheck	3m 9s
test-coverage	8m 4s
unittest-matrix (ubuntu-latest, stable)	1m 21s
checks	2m 30s
unittest-matrix (ubuntu-latest, oldstable)	1m 27s
lint	14m 50s
cross-build-collector (windows, 386)	54s
cross-build-collector (windows, amd64)	48s
cross-build-collector (linux, arm, 7)	54s
cross-build-collector (aix, ppc64)	50s
cross-build-collector (linux, riscv64)	52s
cross-build-collector (linux, amd64)	56s
cross-build-collector (linux, s390x)	49s
cross-build-collector (darwin, arm64)	52s
cross-build-collector (linux, ppc64le)	49s
cross-build-collector (linux, arm64)	52s
cross-build-collector (linux, 386)	50s
cross-build-collector (windows, arm64)	55s
cross-build-collector (darwin, amd64)	50s
unittest	4s
	42m 44s

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