Resolve "Flaky ee/spec/services/quick_actions/interpret_service_spec.rb:1069"

What does this MR do?

Changing the let_it_bes back to lets should make this spec consistent.

Screenshots (strongly suggested)

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Fixes #297023 (closed)