Remove duplicated jobs from tests

Job `freezer-tempest-basic-sql` is effectively the same as
basic job, as both of them are testing sqlalchemy backend as of today.

Also sqlalchemy 2.0 us in u-c right now, so a separate test for it is
not needed anymore.

Change-Id: I9ea8a7db805df6add6da38eb12127e905dd9a10a

.zuul.yaml

@@ -1,17 +1,4 @@
-- job:
-    name: freezer-tox-py311-with-sqlalchemy-2x
-    parent: openstack-tox-py311
-    description: |
-      Run unit tests with main branch of SQLAlchemy, alembic and oslo.db.
-      Takes advantage of the base tox job's install-siblings feature.
-    # The job only tests the latest and shouldn't be run on the stable branches
-    branches: ^master$
-    required-projects:
-      - name: github.com/sqlalchemy/sqlalchemy
-        override-checkout: main
-      - name: github.com/sqlalchemy/alembic
-        override-checkout: main
-      - name: openstack/oslo.db
+---
 
 - project:
     templates:
@@ -24,11 +11,7 @@
       jobs:
         - openstack-tox-pylint
         - freezer-tempest-basic
-        - freezer-tempest-basic-sql
-        - freezer-tox-py311-with-sqlalchemy-2x
     gate:
       jobs:
         - openstack-tox-pylint
         - freezer-tempest-basic
-        - freezer-tempest-basic-sql
-        - freezer-tox-py311-with-sqlalchemy-2x