Add failing test for failing to update child-parent relation when the child has been prefetched in QB #6676

Job	Run time
PHPUnit with SQLite (7.1, highest)	49s
PHPUnit with SQLite (7.1, lowest)	1m 4s
PHPUnit with SQLite (7.2, default, pdo_sqlite, common)	1m 0s
PHPUnit with SQLite (7.3, default, pdo_sqlite, common)	54s
PHPUnit with SQLite (7.4, default, pdo_sqlite, common)	1m 10s
PHPUnit with SQLite (8.0, default, pdo_sqlite, common)	49s
PHPUnit with SQLite (8.1, default, pdo_sqlite, common)	53s
PHPUnit with SQLite (8.2, default, pdo_sqlite, common)	1m 0s
PHPUnit with SQLite (8.0, 2.13, pdo_sqlite)	1m 0s
PHPUnit with SQLite (8.2, 3@dev, pdo_sqlite)	56s
PHPUnit with SQLite (8.2, default, sqlite3)	47s
PHPUnit with SQLite (8.1, default, lazy-ghost, pdo_sqlite)	45s
PHPUnit with MariaDB	0s
PHPUnit with MySQL	0s
PHPUnit with PostgreSQL	0s
Upload coverage to Codecov	0s
	11m 7s

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