Reinstate MySQL tests

Looks like the problem is upstream in 🐛 Cannot create Search API based views On Drupal 11 Active

Very vague error so it was a real pain to see where it was going wrong. For convenience, the error:

Ai Search Setup My Sql (Drupal\Tests\ai_search\Functional\AiSearchSetupMySql)
⚠ Field indexing options
✘ Search view
┐
├ Exception: Warning: Undefined array key "title"
├ Drupal\views\Views::fetchPluginNames()() (Line: 157)

Confirmed tests pass locally again when applying the patch from 🐛 Cannot create Search API based views On Drupal 11 Active

Search API change is now fixed, waiting on 🐛 PHPUnit job hangs as of update to PHPUnit 11.5.29 Active now for Gitlab CI to be working again

Looks like mostly passing now but one error in Drupal\Tests\ai\Kernel\Utility\TextChunkerTest which I guess must also be an error elsewhere as I don't think at a glance that it has to do with this reinstate.

Okay retry passed all green now. I think food to merge, unless any concerns Marcus?

Given it's a test only change that can easily be reverted again, merging to be able to then progress again on other ai search issues

I'm late to this - but the error was probably due to a issue they had on Gitlab on Sunday anway.