Ensure harvester cloud creds with expiration date of 0 are sorted correctly

[richard-cox]

Summary

Ensure harvester cloud creds with expiration date of 0 are sorted correctly

Occurred changes and/or fixed issues

• Follows on from Fix cloud-credential expiry display #12335
  • and comment in [Backport v2.9] Fix cloud-credential expiry display #12336
• sort order should be expired --> expiring --> never expires
• ensure expired 0 is not in the same bucket as never expires

Areas or cases that should be tested

• Harvester Cloud Credential page with an expired annotation value of 0 appear immediately after / before (depending on sort order) expiring and then expired tokens
  • I hacked get expires() for an easier production

Screenshot/Video

Checklist

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• The PR has automated tests or clear instructions for manual tests and the linked issue has appropriate QA labels, or tests are not needed
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[richard-cox]

Once this merges harvester/harvesterhci.io#72 should come out of draft

[torchiaf]

LGTM