Remove SQLAlchemy tips jobs

The most recent SQLAlchemy and Alembic versions are now in
upper-constraints. As a result, this job has served its purpose and can
be removed. For more information, see [1].

[1] https://lists.openstack.org/archives/list/openstack-discuss@lists.openstack.org/thread/RBHXHTO3GUOOXVSZXD4C2O3TKDOH2QSC/

Signed-off-by: Stephen Finucane <stephenfin@redhat.com>
Depends-on: https://review.opendev.org/c/openstack/requirements/+/879743
Change-Id: I1e9c6b951c564b8a038737a1072a6df73aa925a6

.zuul.yaml

@@ -193,21 +193,6 @@
     vars:
       grenade_from_branch: stable/2023.1
 
-- job:
-    name: heat-tox-py310-with-sqlalchemy-2x
-    parent: openstack-tox-py310
-    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:
     queue: heat
     templates:
@@ -225,7 +210,6 @@
         - heat-functional
         - heat-functional-legacy
         - heat-functional-centos-9-stream
-        - heat-tox-py310-with-sqlalchemy-2x
     gate:
       jobs:
         - grenade-heat-multinode