refactor: remove Redis cache implementation leftovers (DEV-1503)

[mpro7]

Issue Number: DEV-1503

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-1503 · DSP-API: Remove Redis related implementation leftovers
➡️  Part of Epic DEV-1429 · Maintenance DSP-API

[codecov]

Codecov Report

Base: 86.68% // Head: 86.47% // Decreases project coverage by -0.20% ⚠️

Coverage data is based on head (b320a0e) compared to base (26e9596).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2290      +/-   ##
==========================================
- Coverage   86.68%   86.47%   -0.21%     
==========================================
  Files         250      267      +17     
  Lines       28252    28215      -37     
==========================================
- Hits        24490    24399      -91     
- Misses       3762     3816      +54     

Impacted Files	Coverage Δ
...p-shared/src/main/scala/dsp/valueobjects/Iri.scala	93.93% <100.00%> (+0.12%)	⬆️
...sp-shared/src/main/scala/dsp/valueobjects/V2.scala	90.27% <100.00%> (+0.27%)	⬆️
.../scala/org/knora/webapi/responders/Responder.scala	75.00% <0.00%> (-16.43%)	⬇️
...org/knora/webapi/routing/v2/ResourcesRouteV2.scala	88.27% <0.00%> (-5.79%)	⬇️
.../webapi/messages/util/rdf/jenaimpl/JenaModel.scala	86.42% <0.00%> (-2.86%)	⬇️
...n/scala/org/knora/webapi/routing/RouteUtilV2.scala	64.93% <0.00%> (-1.74%)	⬇️
...la/org/knora/webapi/messages/StringFormatter.scala	88.72% <0.00%> (-0.80%)	⬇️
...api/responders/admin/PermissionsResponderADM.scala	90.16% <0.00%> (-0.04%)	⬇️
webapi/src/main/scala/org/knora/webapi/Main.scala	0.00% <0.00%> (ø)
...main/scala/org/knora/webapi/settings/package.scala	100.00% <0.00%> (ø)
... and 58 more

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[BalduinLandolt]

LGTM

[irinaschubert]

There are more occurences of Redis floating around, I was just working sth in the configuration (AppConfig and application.conf) and in there is Redis related stuff, too. Also in the docs, probably.

I would suggest to also take the word "cache" into the PR title (in case we search for it in the future).

[BalduinLandolt]

LGTM