[DPE-9205] Update endpoint in pre-refresh check

[dragomirp]

Update the relation endpoints when switching over, so that clients don't have to wait for topology observer to update the relation.

Checklist

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

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 70.52%. Comparing base (ed4a41b) to head (7caaf95).

Files with missing lines	Patch %	Lines
src/charm.py	0.00%	1 Missing ⚠️

❌ Your patch check has failed because the patch coverage (0.00%) is below the target coverage (33.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff             @@
##           16/edge    #1378      +/-   ##
===========================================
- Coverage    70.53%   70.52%   -0.02%     
===========================================
  Files           16       16              
  Lines         4297     4298       +1     
  Branches       691      691              
===========================================
  Hits          3031     3031              
- Misses        1055     1056       +1     
  Partials       211      211              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[taurus-forever]

That actually fixes pre-refresh-check (as always executed on /leader).
The action promote-to-primary is also works faster (due to topology observer events). Still it takes ~20 seconds.
@dragomirp merging?

BTW, does all CI tests passed with the first try?

[dragomirp]

That actually fixes pre-refresh-check (as always executed on /leader). The action promote-to-primary is also works faster (due to topology observer events). Still it takes ~20 seconds. @dragomirp merging?

For promote-to-primary, we can most probably update the unit peer data. That should trigger an event on the Juju leader and update the endpoints. Should I try as part of this PR?