chore: Remove unused dependency to gatling

[seakayone]

Pull Request Checklist

Task Description/Number

Remove unused dependency to gatling

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

[codecov]

Codecov Report

Base: 86.68% // Head: 86.45% // Decreases project coverage by -0.22% ⚠️

Coverage data is based on head (d7d3099) compared to base (26e9596).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2361      +/-   ##
==========================================
- Coverage   86.68%   86.45%   -0.23%     
==========================================
  Files         250      271      +21     
  Lines       28252    28270      +18     
==========================================
- Hits        24490    24441      -49     
- Misses       3762     3829      +67     

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%)	⬇️
...knora/webapi/responders/v1/ValuesResponderV1.scala	92.73% <0.00%> (-0.01%)	⬇️
...ra/webapi/responders/v2/ResourcesResponderV2.scala	93.43% <0.00%> (-0.01%)	⬇️
... and 65 more

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[BalduinLandolt]

LGTM, thanks for taking it over