Revert "For inplace update, send nontransactional invalidations."

This reverts commit 95c5acb3fc (v17) and
counterparts in each other non-master branch.  If released, that commit
would have caused a worst-in-years minor release regression, via
undetected LWLock self-deadlock.  This commit and its self-deadlock fix
warrant more bake time in the master branch.

Reported by Alexander Lakhin.

Discussion: https://postgr.es/m/10ec0bc3-5933-1189-6bb8-5dec4114558e@gmail.com

src/backend/commands/event_trigger.c

@@ -975,6 +975,11 @@ EventTriggerOnLogin(void)
 				 * this instead of regular updates serves two purposes. First,
 				 * that avoids possible waiting on the row-level lock. Second,
 				 * that avoids dealing with TOAST.
+				 *
+				 * Changes made by inplace update may be lost due to
+				 * concurrent normal updates; see inplace-inval.spec. However,
+				 * we are OK with that.  The subsequent connections will still
+				 * have a chance to set "dathasloginevt" to false.
 				 */
 				systable_inplace_update_finish(state, tuple);
 			}