Issue #3575945: Add hasService('database') guard in RedisBackend::deleteMultiple()

Charles Tantonrequested to merge
issue/redis-3575945:foxtrotcharlie-2.x-patch-45655 into 2.x

Closes #3575945

Adds \Drupal::hasService('database') to the existing hasContainer() guard in RedisBackend::deleteMultiple().

During container compilation (e.g. triggered by HookCollectorKeyValueWritePass in Drupal 11.3), hasContainer() returns TRUE but the database service definition has not yet been registered,causing a ServiceNotFoundException. This broke ExistingSite tests (weitzman/drupal-test-traits) during setUp().

This is the 2.x equivalent of the 8.x-1.x fix in MR !90 (merged).

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