Enable RuboCop `Layout/ClassStructure` #10907

Job	Run time
Ruby 3.1 on ubuntu-latest	14m 30s
lint_node	26s
Ruby 3.2 on ubuntu-latest	14m 8s
Ruby 3.3 on ubuntu-latest	9m 14s
lint_ruby	25s
Ruby 3.1 on macos-latest	11m 11s
Ruby 3.2 on macos-latest	7m 54s
build_node (ubuntu-latest)	1m 9s
Ruby 3.3 on macos-latest	6m 11s
build_node (macos-latest)	1m 8s
Verify Jekyll website builds	11s
Ruby 3.1 on windows-latest	18m 34s
build_node (windows-latest)	5m 11s
Ruby 3.2 on windows-latest	18m 54s
Ruby 3.3 on windows-latest	1m 36s
	1h 50m 42s

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