Revert "Fix Test Failure in multi-mx in PG17 (#7722)"

This reverts commit e4040dd.

Reverting for now as this commit is fixing more than one thing
at once at multi_extension.out file

Its a harmless revert for testing purposes

src/test/regress/bin/normalize.sed

@@ -309,8 +309,3 @@ s/permission denied to terminate process/must be a superuser to terminate superu
 s/permission denied to cancel query/must be a superuser to cancel superuser query/g
 
 #endif /* PG_VERSION_NUM < PG_VERSION_16 */
-
-# pg17 changes
-
-# multi_mx_router_planner normalize public.pg_temp_xxxxx
-s/DEBUG:  drop auto-cascades to type public\.pg_temp_[0-9]+/DEBUG:  drop auto-cascades to type public.pg_temp_xxxxx/g

src/test/regress/expected/ch_bench_having_mx.out

@@ -1,8 +1,3 @@
--- Two alternative test outputs:
--- ch_bench_having_mx.out for PG16 and before
--- ch_bench_having_mx_0.out for PG17
--- related commit
--- https://github.com/postgres/postgres/commit/fd0398fc
 ALTER SEQUENCE pg_catalog.pg_dist_shardid_seq RESTART 1640000;
 SET citus.shard_replication_factor to 1;
 SET citus.shard_count to 4;