Moved metadata_store into database and content_discovery #2833

Job	Run time
changes	4s
gatekeeper	3s
env	1s
application_tester	0s
documentation	0s
guitest	0s
mac	0s
pytest	0s
ubuntu	0s
windows	0s
coverage_draft / generate and upload	4m 32s
application_tester_draft / run (ubuntu-latest)	2m 54s
guitest_draft / run (windows-latest)	3m 1s
scripttest_draft / run	1m 5s
	11m 40s

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