refactor: Move and rename UserADM

[BalduinLandolt]

Pull Request Checklist

Task Description/Number

Issue Number

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

[linear]

DEV-3155 Streamline User Identifier objects

[codecov]

Codecov Report

Attention: 16 lines in your changes are missing coverage. Please review.

Comparison is base (eac5751) 11.74% compared to head (0a0c053) 88.57%.
Report is 5 commits behind head on main.

Files	Patch %	Lines
...ra/webapi/responders/admin/UsersResponderADM.scala	71.42%	8 Missing ⚠️
...g/knora/webapi/slice/admin/domain/model/User.scala	87.50%	5 Missing ⚠️
...scala/org/knora/webapi/routing/Authenticator.scala	50.00%	1 Missing ⚠️
.../slice/admin/api/service/UsersADMRestService.scala	50.00%	1 Missing ⚠️
...i/slice/admin/domain/service/DspIngestClient.scala	85.71%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2978       +/-   ##
===========================================
+ Coverage   11.74%   88.57%   +76.82%     
===========================================
  Files         246      250        +4     
  Lines       22907    22934       +27     
===========================================
+ Hits         2690    20313    +17623     
+ Misses      20217     2621    -17596     

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[linear]

DEV-3155 Streamline User Identifier objects

[mpro7]

Thanks!