EPMRPP-95285 || Unable to Unlink the issue & EPMRPP-95281 || Wrong validation message

[maria-hambardzumian]

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

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

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

See analysis details on SonarCloud

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.11%. Comparing base (46b0119) to head (f4aeb62).

Additional details and impacted files

@@            Coverage Diff             @@
##           rc/5.12.0    #4011   +/-   ##
==========================================
  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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