Rename injection point for invalidation messages at end of transaction

Rename injection point for invalidation messages at end of transaction

This injection point was named "AtEOXact_Inval-with-transInvalInfo", not
respecting the implied naming convention that injection points should
use lower-case characters, with terms separated by dashes.  All the
other points defined in the tree follow this style, so let's be more
consistent.

Author: Hayato Kuroda <kuroda.hayato@fujitsu.com>
Reviewed-by: Aleksander Alekseev <aleksander@timescale.com>
Discussion: https://postgr.es/m/OSCPR01MB14966E14C1378DEE51FB7B7C5F5B32@OSCPR01MB14966.jpnprd01.prod.outlook.com
Backpatch-through: 17