fix(api-server): Refresh correctly server when OIDC config changes

[OpenGuidou]

Fixes #18576

Very few tests in that part of the code (in fact none 😨 ) so it's hard to add one to cover this case.

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• The title of the PR conforms to the Toolchain Guide
• I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
• I have signed off all my commits as required by DCO
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My build is green (troubleshooting builds).
• My new feature complies with the feature status guidelines.
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• Optional. My organization is added to USERS.md.
• Optional. For bug fixes, I've indicated what older releases this fix should be cherry-picked into (this may or may not happen depending on risk/complexity).

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 5 lines in your changes missing coverage. Please review.

Project coverage is 56.00%. Comparing base (195de1a) to head (597d2c5).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
cmd/argocd-server/commands/argocd_server.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #20384      +/-   ##
==========================================
- Coverage   56.01%   56.00%   -0.01%     
==========================================
  Files         322      322              
  Lines       44742    44748       +6     
==========================================
+ Hits        25061    25062       +1     
- Misses      17077    17080       +3     
- Partials     2604     2606       +2     

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