refactor: Migrate user group endpoints to Tapir and remove UserRouteADM

[seakayone]

• Add ensureSystemAdminOrProjectAdmin(User, ProjectIri) to AuthorizationRestService
• Migrate PUT /admin/users/iri/<userIri>/SystemAdmin to Tapir
• Migrate POST /admin/users/iri/<userIri>/project-memberships/<projectIri> to Tapir
• Migrate DELETE /admin/users/iri/<userIri>/project-memberships/<projectIri> to Tapir
• Migrate POST /admin/users/iri/<userIri>/project-admin-memberships/<projectIri> to Tapir
• Migrate DELETE /admin/users/iri/<userIri>/project-admin-memberships/<projectIri> to Tapir
• Migrate POST /admin/users/iri/<userIri>/group-memberships/<groupIri> to Tapir
• Migrate DELETE /admin/users/iri/<userIri>/group-memberships/<groupIri> to Tapir
• Remove UsersRouteADM

Pull Request Checklist

Task Description/Number

Issue Number: DEV-

PR Type

• build/chore: maintenance tasks (no production code change)
• docs: documentation changes (no production code change)
• feat: represents new features
• fix: represents bug fixes
• perf: performance improvements
• refactor: represents production code refactoring
• test: adding or refactoring tests (no production code change)

Basic requirements for bug fixes and features

• Tests for the changes have been added
• Docs have been added / updated

Does this PR introduce a breaking change?

• Yes

Does this PR change client-test-data?

• Yes

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (eac5751) 11.74% compared to head (89aa9dd) 11.99%.
Report is 69 commits behind head on main.

Files	Patch %	Lines
...src/main/scala/dsp/valueobjects/LanguageCode.scala	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3046      +/-   ##
==========================================
+ Coverage   11.74%   11.99%   +0.24%     
==========================================
  Files         246      262      +16     
  Lines       22907    22739     -168     
==========================================
+ Hits         2690     2727      +37     
+ Misses      20217    20012     -205     

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