Issue #3529128: Add fix for PostgresSQL collisions, fix CI caching, restore fix for 11.2 phpunit flakiness

Sally Youngrequested to merge
issue/canvas-3529128:3529128-phpunit-postgressql into 1.x
  • Adds a fix for PostgresSQL collisions
  • Fixes paths for CI pipeline caching (because I needed an MR to test it on 😓 )
  • Restores a fix for sqlite flakiness in 11.2 (not needed for 11.3 because it uses the canvas phpunit configuration in phpunit subprocesses)

Testing instructions

Tests passing

Closes #3529128

Edited by Sally Young

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