commit-message-sync-for-xxxx-example.txt

Updates for testing period for xx.xx release

* charm-helpers sync for classic charms
* build.lock file for reactive charms
* ensure tox.ini is from release-tools
* Locked requirements using pip-compile:
  * existing (test-)requirements.txt ->
    (test-)requirements.in
  * pip-compile to *-py3[8|10].txt using python3.8
    and python3.10.
  * Updated tox.ini to use the appropriate merged
    requirements-*.txt files.
* Removal of lunar from metadata, charmcraft.yaml
  osci.yaml, tests.yaml and associated bundles.
* Locked libs and tests to stable/bobcat branches for:
  * charm-helpers
  * charms.openstack
  * zaza
  * zaza-openstack-tests