Comment out the isolation tests.

Currently there is no easy way make GHA install the "injection_points"
extension. (PGDG packages do not contain it.) Nevertheless, the tests are
useful for local development.

Author: Antonin Houska

Makefile

@@ -9,7 +9,7 @@ pg_rewrite--1.2--1.3.sql
 DOCS = pg_rewrite.md
 
 REGRESS = pg_rewrite
-ISOLATION = pg_rewrite_concurrent
+#ISOLATION = pg_rewrite_concurrent
 
 PGXS := $(shell $(PG_CONFIG) --pgxs)
 include $(PGXS)