Refactor quick action interpret_service_spec spec to correctly support externalisation
<!--IssueSummary start--> <details> <summary> Everyone can contribute. [Help move this issue forward](https://handbook.gitlab.com/handbook/marketing/developer-relations/contributor-success/community-contributors-workflows/#contributor-links) while earning points, leveling up and collecting rewards. </summary> - [Work on this issue](https://contributors.gitlab.com/manage-issue?action=work&projectId=278964&issueIid=365253) - [Close this issue](https://contributors.gitlab.com/manage-issue?action=close&projectId=278964&issueIid=365253) </details> <!--IssueSummary end--> ## Summary The [`interpret_service_spec.rb`](https://gitlab.com/gitlab-org/gitlab/-/blob/master/spec/services/quick_actions/interpret_service_spec.rb) file currently tests a number of strings in a way that does not follow the [guidelines](https://docs.gitlab.com/ee/development/i18n/externalization.html#test-files) for test files. ## Improvements These files should have the proper externalisation anchors around string content. ## Risks This should be low risk. The tests should pass before and after the change ## Involved components https://gitlab.com/gitlab-org/gitlab/-/blob/master/spec/services/quick_actions/interpret_service_spec.rb ## Optional: Intended side effects Testing of quick actions should correctly cover externalised content ## Optional: Missing test coverage <!-- If you are aware of tests that need to be written or adjusted apart from unit tests for the changed components, please list them here. --> <!-- Please select the appropriate label from the following: ~"feature::addition" ~"type::maintenance" ~"maintenance::refactor" ~"maintenance::pipelines" ~"maintenance::workflow" -->
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