IBX-12046: Removed the deprecated dbal.use_savepoints option from the test kernel config

[ViniTou]

🎫 Issue	IBX-12046

Related PRs:

• IBX-12046: Configured property-info and Doctrine ORM explicitly in the test kernel #58 — stacked on it; merge IBX-12046: Configured property-info and Doctrine ORM explicitly in the test kernel #58 first, then this PR is rebased onto 6.0.
• Merge AFTER these — they fix the Doctrine deprecations this PR makes visible to consumers' deprecation gates:
  • IBX-12046: Configured the legacy integration test kernel for property-info and Doctrine native lazy objects core#840 — core's own legacy test kernel config (used by LegacyContentFilteringTest in phpunit-integration.xml)
  • IBX-12046: Replaced deprecated DBAL quoteIdentifier() calls with quoteSingleIdentifier() core#841
  • https://github.com/ibexa/segmentation/pull/245
  • https://github.com/ibexa/fieldtype-page/pull/237
  • https://github.com/ibexa/form-builder/pull/268
  • https://github.com/ibexa/migrations/pull/466
  • IBX-12046: Replaced deprecated DBAL quoteIdentifier() calls with quoteSingleIdentifier() fieldtype-richtext#358
  • IBX-12046: Replaced deprecated DBAL quoteIdentifier() calls with quoteSingleIdentifier() system-info#98
  • https://github.com/ibexa/product-catalog/pull/1605

Description:

DBAL 4 always nests transactions with savepoints; DoctrineBundle 2.x deprecates dbal.use_savepoints and DoctrineBundle 3 — required by Symfony 8 — removes it, so the key has to go before that switch.

It also had a side effect: its deprecation fires while the container compiles, before FrameworkBundle::boot() sets DOCTRINE_DEPRECATIONS=trigger. doctrine/deprecations caches its mode on the first trigger, so it cached "none" and every Doctrine deprecation in the test run stayed silent. Without the key, Doctrine deprecations reach the PHPUnit deprecation gate — the PRs above remove the ones that fire inside tests (DBAL quoteIdentifier(), doctrine/collections Criteria without raw field access, core's legacy kernel config). Doctrine deprecations raised only while test-core's Bootstrapper installs the schema (ibexa/doctrine-schema's DBAL schema API use) fire before PHPUnit's handler and don't reach the gate.

For QA:

No functional change. Swept all 53 gated repositories that use ibexa/test-core with this change installed (PHP 8.4, every gated config, Doctrine deprecation callers traced): the only callers reaching a gate are the ones fixed by the PRs above (seen in ibexa/core, ibexa/checkout, ibexa/connector-qualifio). Re-verified with the fixes installed: core's phpunit-integration.xml with core#840 + core#841 exits 0 on PHP 8.3 and 8.4; the consumer baselines are regenerated separately.

Documentation:

N/A