Retire wikidata/browsertests
Clearing out repository according to
https://www.mediawiki.org/wiki/Gerrit/Inactive_projects#Actions_to_deactivate_an_unused_repository:
"Remove all files in a new commit or make a commit that disables the
software contained in it"
Bug: T144486
Change-Id: I2e66342a7b1ad2994e82d7fc0d49bd45c53d8983