Fix failing qunit tests

[gesinn-it-wam]

Setup

• MW version: 1.35
• DB (MySQL etc.): SQLite
• PHP version: 7.4.25
• SMW version: master
• SRF version: master
• Browsers and versions: Firefox, Chrome

Issue

Most QUnit test are running again after fixing #652. Some failing tests are remaining, all with an async background:

• Unfinished animations in tests
  • ext.srf.formats.eventcalendar: update
  • ext.srf.formats.datatables: table init and update
  • ext.srf.formats.tagcloud: load
• Pending AJAX requests in test
  • ext.srf.formats.datatables: Issue#172: table with subject printout
• Timeout in test
  • ext.srf.formats.tagcloud: sphere

[gesinn-it-gea]

maybe related to "Unfiinished animations" issue: https://phabricator.wikimedia.org/T162876