sync-internal-tags needs to run before sync-snaps on release day

The sync-internal-tags job runs every 12 hours. It ran just before 1.24 GA was released upstream. This means our internal k8s fork did not have the 1.24.0 tag.

Then sync-snaps ran and tried to figure out a non pre-release semver based on the branch name. That failed like this:

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15:23:30 20:23:30 | INFO [kube-apiserver] Latest branch version 1.23.6
15:23:30 20:23:30 | INFO [kube-apiserver] > Versions match 1.23.6 == 1.23.6, not building a new snap
15:23:30 20:23:30 | INFO [kube-apiserver] > Checking snaps in version 1.24 for arch amd64
15:23:30 20:23:30 | INFO [kube-apiserver] Found snap version 1.24.0-rc.1 at revision 2756 for 1.24/edge
15:23:32 Traceback (most recent call last):
15:23:32 File "jobs/sync-upstream/sync.py", line 405, in <module>
15:23:32 cli()
15:23:32 File "/var/lib/jenkins/slaves/jenkins-slave-focal-3/workspace/sync-snaps/.tox/py38/lib/python3.8/site-packages/click/core.py", line 1130, in __call__
15:23:32 return self.main(*args, **kwargs)
15:23:32 File "/var/lib/jenkins/slaves/jenkins-slave-focal-3/workspace/sync-snaps/.tox/py38/lib/python3.8/site-packages/click/core.py", line 1055, in main
15:23:32 rv = self.invoke(ctx)
15:23:32 File "/var/lib/jenkins/slaves/jenkins-slave-focal-3/workspace/sync-snaps/.tox/py38/lib/python3.8/site-packages/click/core.py", line 1657, in invoke
15:23:32 return _process_result(sub_ctx.command.invoke(sub_ctx))
15:23:32 File "/var/lib/jenkins/slaves/jenkins-slave-focal-3/workspace/sync-snaps/.tox/py38/lib/python3.8/site-packages/click/core.py", line 1404, in invoke
15:23:32 return ctx.invoke(self.callback, **ctx.params)
15:23:32 File "/var/lib/jenkins/slaves/jenkins-slave-focal-3/workspace/sync-snaps/.tox/py38/lib/python3.8/site-packages/click/core.py", line 760, in invoke
15:23:32 return __callback(*args, **kwargs)
15:23:32 File "jobs/sync-upstream/sync.py", line 370, in snaps
15:23:32 snap_service_obj.sync_all_track_snaps()
15:23:32 File "/var/lib/jenkins/slaves/jenkins-slave-focal-3/workspace/sync-snaps/cilib/service/snap.py", line 149, in sync_all_track_snaps
15:23:32 self.snap_model.base.latest_branch_from_major_minor(
15:23:32 File "/var/lib/jenkins/slaves/jenkins-slave-focal-3/workspace/sync-snaps/cilib/models/repos/__init__.py", line 63, in latest_branch_from_major_minor
15:23:32 return self._latest_from_semver(self.branches, major_minor, exclude_pre)
15:23:32 File "/var/lib/jenkins/slaves/jenkins-slave-focal-3/workspace/sync-snaps/cilib/models/repos/__init__.py", line 102, in _latest_from_semver
15:23:32 max_ver = max(map(version.parse, _semvers))
15:23:32 ValueError: max() arg is an empty sequence
15:23:32 ERROR: InvocationError for command /var/lib/jenkins/slaves/jenkins-slave-focal-3/workspace/sync-snaps/.tox/py38/bin/python jobs/sync-upstream/sync.py snaps (exited with code 1)
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We need to either adjust the timing of those 2 jobs, handle errors gracefully, or both.