refactor: Move code from UsersResponder to UserService and UserRestService

[seakayone]

• Replace UserResponder in Authenticator with UserService
• Rename UserInformationTypeADM to UserInformationType
• Move findByEmail and findByUsername to RestService
• rm unused code
• Move getProjectMemberShipsByUserIri to RestService
• Move getProjectAdminMemberShipsByUserIri to RestService
• Introduce ProjectADMService.findByIds(Seq[ProjectIri])
• Extract getKnoraUserOrNotFound
• fmt

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

[linear]

DEV-3291 Remove the `UsersResponder`

[codecov]

Codecov Report

Attention: Patch coverage is 97.50000% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 88.55%. Comparing base (eac5751) to head (f874e71).
Report is 88 commits behind head on main.

Files	Patch %	Lines
...knora/webapi/responders/admin/UsersResponder.scala	90.90%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #3067       +/-   ##
===========================================
+ Coverage   11.74%   88.55%   +76.81%     
===========================================
  Files         246      262       +16     
  Lines       22907    22513      -394     
===========================================
+ Hits         2690    19937    +17247     
+ Misses      20217     2576    -17641     

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[BalduinLandolt]

Over all I like it. Added one (non-blocking) question that left me a bit confused