In {T232608} the daily browser tests for TwoColConflict are being reported as broken, and the job being deleted after 30 days. Before going default with the extension we need to restore this safety net.
Acceptance criteria:
[] We understand what failed and fixed it
[] The test run once a day
[] Failing tests send an email to techwish-devs@wikimedia.de
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Foes vanquished:
* [[ https://gerrit.wikimedia.org/r/#/c/mediawiki/extensions/TwoColConflict/+/540105/ | patch ]] Use wdio-mediawiki public API rather than peeking at internal files using relative paths.
* [[ https://gerrit.wikimedia.org/r/#/c/mediawiki/extensions/TwoColConflict/+/541197/ | patch ]] Temporarily hide the beta features "save" bar, it has problematic floating behavior and obscures UI elements.
* [[ https://gerrit.wikimedia.org/r/#/c/mediawiki/extensions/TwoColConflict/+/541256/ | patch ]] Disable "2017 wikitext source editor", this doesn't provide a simple ES interface to let us set content.