refactor: Replace MessageRelay with KnoraProjectRepo in OntologyResponderV2

[seakayone]

Pull Request Checklist

Task Description/Number

Issue Number: NO-PROJECT

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: 48 lines in your changes are missing coverage. Please review.

Comparison is base (3e95d71) 11.68% compared to head (3a1fca0) 11.71%.
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2920      +/-   ##
==========================================
+ Coverage   11.68%   11.71%   +0.02%     
==========================================
  Files         251      248       -3     
  Lines       23065    23017      -48     
==========================================
+ Hits         2695     2696       +1     
+ Misses      20370    20321      -49     

Files	Coverage Δ
.../slice/admin/domain/service/KnoraProjectRepo.scala	100.00% <100.00%> (ø)
...bapi/src/main/scala/dsp/valueobjects/Project.scala	86.74% <85.71%> (+0.32%)	⬆️
webapi/src/main/scala/org/knora/webapi/Main.scala	0.00% <0.00%> (ø)
...i/slice/admin/domain/service/DspIngestClient.scala	52.00% <0.00%> (ø)
...ce/admin/domain/service/ProjectImportService.scala	9.80% <0.00%> (-1.74%)	⬇️
...ra/webapi/slice/infrastructure/MetricsServer.scala	0.00% <0.00%> (ø)
...ebapi/slice/infrastructure/api/PrometheusApp.scala	0.00% <0.00%> (ø)
...ce/admin/domain/service/ProjectExportService.scala	0.00% <0.00%> (ø)
...lice/admin/repo/service/KnoraProjectRepoLive.scala	0.00% <0.00%> (ø)
...ora/webapi/responders/v2/OntologyResponderV2.scala	0.00% <0.00%> (ø)
... and 1 more

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[BalduinLandolt]

nice!