Refactor quick action interpret_service_spec spec to correctly support externalisation
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## 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
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