ROX-32452: implement token generation service for the OCP plugin

[rhybrillou]

Description

PR stack:

• ROX-32452: create token generation service for the OCP plugin #18456
  • refactor: create common issuer source for token generation services #18543
    • refactor: use new issuer source for rox token services #18544
      • ROX-32452: implement token generation service for the OCP plugin #18545 👈

User-facing documentation

• CHANGELOG.md is updated OR update is not needed
• documentation PR is created and is linked above OR is not needed

Testing and quality

• the change is production ready: the change is GA, or otherwise the functionality is gated by a feature flag
• CI results are inspected

Automated testing

• added unit tests
• added e2e tests
• added regression tests
• added compatibility tests
• modified existing tests

How I validated my change

change me!

[rhacs-bot]

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[codecov]

Codecov Report

❌ Patch coverage is 89.58333% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.01%. Comparing base (0a84d21) to head (5752516).

Files with missing lines	Patch %	Lines
central/auth/ocpplugin/service/singleton.go	43.75%	9 Missing ⚠️
central/auth/ocpplugin/service/service_impl.go	85.36%	6 Missing ⚠️

Additional details and impacted files

@@                              Coverage Diff                              @@
##           master-yann/plug-common-tokenbased-source   #18545      +/-   ##
=============================================================================
+ Coverage                                      48.98%   49.01%   +0.02%     
=============================================================================
  Files                                           2632     2635       +3     
  Lines                                         197902   198046     +144     
=============================================================================
+ Hits                                           96947    97075     +128     
- Misses                                         93565    93581      +16     
  Partials                                        7390     7390              

Flag	Coverage Δ
go-unit-tests	49.01% <89.58%> (+0.02%)	⬆️

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