remove WikibaseDatabase submodule

It has been deleted from gerrit, now maintained on github:

https://github.com/wmde/WikibaseDatabase

this will fix code update on beta labs

https://integration.wikimedia.org/ci/job/beta-code-update/22473/console

Change-Id: I438d086e1c4e07d996219e350f2fa24024b7988d
Merge "remove WikibaseDatabase submodule"
Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  f5f80d921040c95ac0c297932786409800fcb4d5

Factor out getHtmlForClaim from EntityView

Bug: 50578
Change-Id: I1b0825aabf5d7dd498119eec4f45dee19c83e8e3