Invalidate partitions of table being attached/detached

Invalidate partitions of table being attached/detached

Failing to do that, any direct inserts/updates of those partitions
would fail to enforce the correct constraint, that is, one that
considers the new partition constraint of their parent table.

Backpatch to 10.

Reported by: Hou Zhijie <[email protected]>
Author: Amit Langote <[email protected]>
Author: Álvaro Herrera <[email protected]>
Reviewed-by: Nitin Jadhav <[email protected]>
Reviewed-by: Pavel Borisov <[email protected]>
Discussion: https://postgr.es/m/OS3PR01MB5718DA1C4609A25186D1FBF194089%40OS3PR01MB5718.jpnprd01.prod.outlook.com