Remove overzealous index deletion assertion.

A broken HOT chain is not an unexpected condition, even when the offset
number points past the end of the page's line pointer array.
heap_prune_chain() does not (and never has) treated this condition as
unexpected, so derivative code in heap_index_delete_tuples() shouldn't
do so either.

Oversight in commit 4228817.

The assertion can probably only fail on Postgres 14 and master.  Earlier
releases don't have commit 3c3b8a4, which taught VACUUM to truncate the
line pointer array of heap pages.  Backpatch all the same, just to be
consistent.

Author: Peter Geoghegan <[email protected]>
Reported-By: Alexander Lakhin <[email protected]>
Discussion: https://postgr.es/m/[email protected]
Backpatch: 12-, just like commit 4228817.

Author: petergeoghegan

src/backend/access/heap/heapam.c

@@ -7485,10 +7485,7 @@ heap_index_delete_tuples(Relation rel, TM_IndexDeleteOp *delstate)
 
 			/* Some sanity checks */
 			if (offnum < FirstOffsetNumber || offnum > maxoff)
-			{
-				Assert(false);
 				break;
-			}
 
 			lp = PageGetItemId(page, offnum);
 			if (ItemIdIsRedirected(lp))