Add feature flag support to GlobalState #11475

Job	Run time
build_node (ubuntu-latest)	1m 34s
build_node (macos-latest)	1m 34s
Ruby 3.1 on ubuntu-latest	15m 12s
build_node (windows-latest)	6m 20s
lint_node	39s
Ruby 3.2 on ubuntu-latest	16m 29s
Ruby 3.3 on ubuntu-latest	12m 28s
spelling	15s
Ruby 3.1 on macos-latest	8m 44s
lint_ruby	25s
Ruby 3.2 on macos-latest	9m 46s
Ruby 3.3 on macos-latest	9m 28s
Verify Jekyll website builds	9s
Ruby 3.1 on windows-latest	27m 30s
Ruby 3.2 on windows-latest	24m 41s
Ruby 3.3 on windows-latest	23m 54s
	2h 39m 8s

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