EPMRPP-91756 || Remove old plugins mechanism

[AmsterGet]

PR Checklist

• Have you verified that the PR is pointing to the correct target branch? (develop for features/bugfixes, other if mentioned in the task)
• Have you verified that your branch is consistent with the target branch and has no conflicts? (if not, make a rebase under the target branch)
• Have you checked that everything works within the branch according to the task description and tested it locally?
• Have you run the linter (npm run lint) prior to submission? Enable the git hook on commit in your IDE to run it and format the code automatically.
• Have you run the tests locally and added/updated them if needed?
• Have you checked that app can be built (npm run build)?
• Have you made sure that all the necessary pipelines has been successfully completed?
• If the task requires translations to be updated, have you done this by running the manage:translations script?

Visuals

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.11%. Comparing base (26b4919) to head (003fcaa).
Report is 2 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3925   +/-   ##
========================================
  Coverage    60.11%   60.11%           
========================================
  Files           80       80           
  Lines          875      875           
  Branches       128      128           
========================================
  Hits           526      526           
  Misses         321      321           
  Partials        28       28           

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
6 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud