bug #40336 [Messenger] Doctrine setup with migrations (Nyholm)

This PR was squashed before being merged into the 5.2 branch.

Discussion
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[Messenger] Doctrine setup with migrations

| Q             | A
| ------------- | ---
| Branch?       | 5.2
| Bug fix?      | yes
| New feature?  |
| Deprecations? | no
| Tickets       | Fix #40130
| License       | MIT
| Doc PR        |

This PR reverts parts of #40055.

When running these commands, You do need to be in a transaction:
- `doctrine:schema:create`
- `messenger:setup-transports`
- `doctrine:migrations:diff` and `doctrine:migrations:migrate`

Commits
-------

3371e1c [Messenger] Doctrine setup with migrations

src/Symfony/Component/Messenger/Bridge/Doctrine/Tests/Transport/PostgreSqlConnectionTest.php

@@ -49,7 +49,19 @@ public function testGetExtraSetupSql()
 
         $table = new Table('queue_table');
         $table->addOption('_symfony_messenger_table_name', 'queue_table');
-        $this->assertStringContainsString('CREATE TRIGGER', implode("\n", $connection->getExtraSetupSqlForTable($table)));
+        $sql = implode("\n", $connection->getExtraSetupSqlForTable($table));
+
+        /*
+         * We need to start a transaction for the following commands to work properly:
+         * doctrine:schema:create
+         * messenger:setup-transports
+         * doctrine:migrations:diff and doctrine:migrations:migrate
+         */
+        $this->assertStringContainsString('BEGIN;', $sql);
+        $this->assertStringContainsString('CREATE TRIGGER', $sql);
+
+        // We MUST NOT commit, that will mess with the PDO in PHP 8
+        $this->assertStringNotContainsString('COMMIT;', $sql);
     }
 
     public function testGetExtraSetupSqlWrongTable()

src/Symfony/Component/Messenger/Bridge/Doctrine/Transport/PostgreSqlConnection.php

@@ -87,7 +87,7 @@ public function setup(): void
     {
         parent::setup();
 
-        $this->executeStatement('BEGIN;'.implode("\n", $this->getTriggerSql()).'COMMIT;');
+        $this->executeStatement(implode("\n", $this->getTriggerSql()));
     }
 
     /**
@@ -109,6 +109,7 @@ public function getExtraSetupSqlForTable(Table $createdTable): array
     private function getTriggerSql(): array
     {
         return [
+            'BEGIN;',
             sprintf('LOCK TABLE %s;', $this->configuration['table_name']),
             // create trigger function
             sprintf(<<<'SQL'