Add checks before generating a release #313

Job	Run time
check-release-branch-state	32s
setup / Setup Build Matrix (true, ubuntu-x86, al2-arm, ubuntu, ubuntu-22.04, codebuild-soci-snapshotter-i...	3s
generate-artifacts (al2-arm)	1m 31s
generate-artifacts (ubuntu-x86)	1m 29s
validate-artifacts (ubuntu-x86)	15s
validate-artifacts (al2-arm)	13s
create-release	-1s
	4m 2s

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