Fix failures with cross-version pg_upgrade tests

Buildfarm members skimmer and crake have reported that pg_upgrade
running from v18 fails due to the changes of d52c24b0f808, with the
expectations that the objects removed in the test module
injection_points should still be present post upgrades, but the test
module does not have them anymore.

The origin of the issue is that the following test modules depend on
injection_points, but they do not drop the extension once the tests
finish, leaving its traces in the dumps used for the upgrades:
- gin, down to v17
- typcache, down to v18
- nbtree, HEAD-only
Test modules have no upgrade requirements, as they are used only for..
Tests, so there is no point in keeping them around.

An alternative solution would be to drop the databases created by these
modules in AdjustUpgrade.pm, but the solution of this commit to drop the
extension is simpler.  Note that there would be a catch if using a
solution based on AdjustUpgrade.pm as the database name used for the
test runs differs between configure and meson:
- configure relies on USE_MODULE_DB for the database name unicity, that
would build a database name based on the *first* entry of REGRESS, that
lists all the SQL tests.
- meson relies on a "name" field.

For example, for the test module "gin", the regression database is named
"regression_gin" under meson, while it is more complex for configure, as
of "contrib_regression_gin_incomplete_splits".  So a AdjustUpgrade.pm
would need a set of DROP DATABASE IF EXISTS to solve this issue, to cope
with each build system.

The failure has been caused by d52c24b0f808, and the problem can happen
with upgrade dumps from v17 and v18 to HEAD.  This problem is not
currently reachable in the back-branches, but it could be possible that
a future change in injection_points in stable branches invalidates this
theory, so this commit is applied down to v17 in the test modules that
matter.

Per discussion with Tom Lane and Heikki Linnakangas.

Discussion: https://postgr.es/m/2899652.1765167313@sss.pgh.pa.us
Backpatch-through: 17

8 files changed, 16 insertions, 0 deletions

diff --git a/src/test/modules/gin/expected/gin_incomplete_splits.out b/src/test/modules/gin/expected/gin_incomplete_splits.out
index 15574e547ac..0f3ac9a0466 100644
--- a/src/test/modules/gin/expected/gin_incomplete_splits.out
+++ b/src/test/modules/gin/expected/gin_incomplete_splits.out
@@ -192,3 +192,4 @@ SELECT injection_points_detach('gin-finish-incomplete-split');
  
 (1 row)
 
+drop extension injection_points;
diff --git a/src/test/modules/gin/sql/gin_incomplete_splits.sql b/src/test/modules/gin/sql/gin_incomplete_splits.sql
index ebf0f620f0c..d451257c275 100644
--- a/src/test/modules/gin/sql/gin_incomplete_splits.sql
+++ b/src/test/modules/gin/sql/gin_incomplete_splits.sql
@@ -148,3 +148,5 @@ select insert_n(:next_i, 10) as next_i
 select verify(:next_i);
 
 SELECT injection_points_detach('gin-finish-incomplete-split');
+
+drop extension injection_points;
diff --git a/src/test/modules/nbtree/expected/nbtree_half_dead_pages.out b/src/test/modules/nbtree/expected/nbtree_half_dead_pages.out
index e94f016696d..c435af7a4a5 100644
--- a/src/test/modules/nbtree/expected/nbtree_half_dead_pages.out
+++ b/src/test/modules/nbtree/expected/nbtree_half_dead_pages.out
@@ -83,3 +83,5 @@ select bt_index_parent_check('nbtree_half_dead_pages_id_idx'::regclass, true, tr
  
 (1 row)
 
+drop extension amcheck;
+drop extension injection_points;
diff --git a/src/test/modules/nbtree/expected/nbtree_incomplete_splits.out b/src/test/modules/nbtree/expected/nbtree_incomplete_splits.out
index 161eb3cbfa8..00168c6ebb8 100644
--- a/src/test/modules/nbtree/expected/nbtree_incomplete_splits.out
+++ b/src/test/modules/nbtree/expected/nbtree_incomplete_splits.out
@@ -184,3 +184,5 @@ SELECT injection_points_detach('nbtree-finish-incomplete-split');
  
 (1 row)
 
+drop extension amcheck;
+drop extension injection_points;
diff --git a/src/test/modules/nbtree/sql/nbtree_half_dead_pages.sql b/src/test/modules/nbtree/sql/nbtree_half_dead_pages.sql
index fd279b87e0e..b39cf275557 100644
--- a/src/test/modules/nbtree/sql/nbtree_half_dead_pages.sql
+++ b/src/test/modules/nbtree/sql/nbtree_half_dead_pages.sql
@@ -46,3 +46,6 @@ select bt_index_parent_check('nbtree_half_dead_pages_id_idx'::regclass, true, tr
 vacuum nbtree_half_dead_pages;
 select * from nbtree_half_dead_pages where id > 99998 and id < 120002;
 select bt_index_parent_check('nbtree_half_dead_pages_id_idx'::regclass, true, true);
+
+drop extension amcheck;
+drop extension injection_points;
diff --git a/src/test/modules/nbtree/sql/nbtree_incomplete_splits.sql b/src/test/modules/nbtree/sql/nbtree_incomplete_splits.sql
index f6b22786d37..23a112a074b 100644
--- a/src/test/modules/nbtree/sql/nbtree_incomplete_splits.sql
+++ b/src/test/modules/nbtree/sql/nbtree_incomplete_splits.sql
@@ -139,3 +139,6 @@ select insert_n(:next_i, 10) as next_i
 select verify(:next_i);
 
 SELECT injection_points_detach('nbtree-finish-incomplete-split');
+
+drop extension amcheck;
+drop extension injection_points;
diff --git a/src/test/modules/typcache/expected/typcache_rel_type_cache.out b/src/test/modules/typcache/expected/typcache_rel_type_cache.out
index a91bd72b9bd..54c61602d08 100644
--- a/src/test/modules/typcache/expected/typcache_rel_type_cache.out
+++ b/src/test/modules/typcache/expected/typcache_rel_type_cache.out
@@ -39,3 +39,4 @@ SELECT '(1,2)'::t;
  (1,2)
 (1 row)
 
+DROP EXTENSION injection_points;
diff --git a/src/test/modules/typcache/sql/typcache_rel_type_cache.sql b/src/test/modules/typcache/sql/typcache_rel_type_cache.sql
index c1a3af509c0..f004a31c32a 100644
--- a/src/test/modules/typcache/sql/typcache_rel_type_cache.sql
+++ b/src/test/modules/typcache/sql/typcache_rel_type_cache.sql
@@ -19,3 +19,5 @@ SELECT '(1)'::t;
 SELECT injection_points_detach('typecache-before-rel-type-cache-insert');
 ALTER TABLE t ADD COLUMN j int;
 SELECT '(1,2)'::t;
+
+DROP EXTENSION injection_points;