refactor: Replace Settings with AppConfig (DEV-1312)

[irinaschubert]

Issue Number: DEV-1312

Pull Request Checklist

Basic Requirements

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix: represents bug fixes
• Refactor: represents production code refactoring
• Feature: represents a new feature
• Documentation: documentation changes (no production code change)
• Chore: maintenance tasks (no production code change)
• Style: styles updates (no production code change)
• Test: all about tests: adding, refactoring tests (no production code change)
• Other... Please describe:

Does this PR introduce a breaking change?

• Yes
• No

Does this PR change client-test-data?

• Yes (don't forget to update the JS-LIB team about the change)
• No

Other information

[swarmia]

✅  Linked to Story DEV-1312 · DSP-API: Remove settings and use AppConfig instead
➡️  Part of Epic DEV-542 · DSP-API Cleanups

[codecov]

Codecov Report

Base: 86.64% // Head: 86.86% // Increases project coverage by +0.22% 🎉

Coverage data is based on head (b7f3e65) compared to base (71c772f).
Patch coverage: 78.54% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2202      +/-   ##
==========================================
+ Coverage   86.64%   86.86%   +0.22%     
==========================================
  Files         233      241       +8     
  Lines       28020    28001      -19     
==========================================
+ Hits        24277    24324      +47     
+ Misses       3743     3677      -66     

Impacted Files	Coverage Δ
...sp-shared/src/main/scala/dsp/valueobjects/V2.scala	84.05% <0.00%> (-1.45%)	⬇️
webapi/src/main/scala/org/knora/webapi/Main.scala	0.00% <0.00%> (ø)
...sponder/projectsmessages/ProjectsMessagesADM.scala	91.19% <ø> (ø)
...tore/triplestoremessages/TriplestoreMessages.scala	74.78% <ø> (-0.22%)	⬇️
...webapi/messages/util/ConstructResponseUtilV2.scala	93.29% <ø> (ø)
...a/org/knora/webapi/messages/util/MessageUtil.scala	36.66% <ø> (ø)
...vsearch/types/GravsearchTypeInspectionRunner.scala	100.00% <ø> (ø)
.../webapi/messages/v2/responder/KnoraRequestV2.scala	0.00% <ø> (ø)
...webapi/messages/v2/responder/KnoraResponseV2.scala	85.18% <ø> (ø)
...s/v2/responder/listsmessages/ListsMessagesV2.scala	90.54% <ø> (ø)
... and 123 more

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[BalduinLandolt]

Looks good to me. If the thing with the test setup that requires repo but no IIIF would make the tests faster, that would be even nicer... but so far so good

[mpro7]

Looks good, just check detailed comments below.