Issue #3611459: Fix PHPUnit test failures on Drupal 11.4 and PHPStan entity storage warnings (2.x backport)

Frank Mablyrequested to merge
issue/domain_path-3611459:3611459-2x-backport into 2.x

Backport of !121 (merged) to the 2.x branch. Same fix: create a dedicated test_page content type in the test base instead of relying on the Standard profile (which no longer ships page/article on Drupal 11.4), re-confirm the Domain Access fields, replace the cached path alias storage property with a pathAliasStorage() accessor, and enable phpunit CI concurrency. Test-only changes.

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