fix: return credentials in FindByCredentialsIdentifier

[aeneasr]

Instead of re-fetching the credentials later (expensive), we load them only once.

Related issue(s)

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security vulnerability, I
  confirm that I got the approval (please contact
  [email protected]) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[codecov]

Codecov Report

Attention: Patch coverage is 88.88889% with 2 lines in your changes missing coverage. Please review.

Project coverage is 78.39%. Comparing base (dbf7274) to head (95c3694).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
session/manager_http.go	0.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4068      +/-   ##
==========================================
- Coverage   78.44%   78.39%   -0.06%     
==========================================
  Files         373      373              
  Lines       26739    26498     -241     
==========================================
- Hits        20975    20772     -203     
+ Misses       4175     4138      -37     
+ Partials     1589     1588       -1     

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