Use charm specific job templates

The openstack-python3-ussuri-jobs template is running on noble (python
3.12) making the pep8 tox target fail due to the dependencies and
versions locked down by the charm.

This change makes the charm to use the
openstack-python3-charm-jobs-ussuri template which runs on focal and
it's owned by the openstack charms team.

For the coverage report, the openstack-cover-charm-jobs template is used
now which provides the same guarantees described earlier

Change-Id: Ic5d63cddf627fa0177323858e3e9cc18b04bbbd4

.zuul.yaml

@@ -1,4 +1,4 @@
 - project:
     templates:
-      - openstack-python3-ussuri-jobs
-      - openstack-cover-jobs
+      - openstack-python3-charm-jobs-ussuri
+      - openstack-cover-charm-jobs

bindep.txt

@@ -0,0 +1,4 @@
+libffi-dev [platform:dpkg]
+libpq-dev [platform:dpkg]
+libxml2-dev [platform:dpkg]
+libxslt1-dev [platform:dpkg]