[MISC] Handle invalid stanza name

[dragomirp]

Handle invalid stanza name in Pgbackrest output (happens when no region is set in GCP) to block as failure to initialise stanza and not as foreign backup

Checklist

• I have added or updated any relevant documentation.
• I have cleaned any remaining cloud resources from my accounts.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.57%. Comparing base (916c5bf) to head (03b3531).
⚠️ Report is 2 commits behind head on 16/edge.

❌ Your project status has failed because the head coverage (64.57%) is below the target coverage (70.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##           16/edge    #1154      +/-   ##
===========================================
+ Coverage    64.55%   64.57%   +0.02%     
===========================================
  Files           17       17              
  Lines         4325     4328       +3     
  Branches       668      669       +1     
===========================================
+ Hits          2792     2795       +3     
  Misses        1351     1351              
  Partials       182      182              

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[marceloneppel]

Thanks for that! LGTM.