Fix a FOSS failure in 'spec/lib/gitlab/usage_data_spec.rb'

What does this MR do?

Because the CE spec was changed to include EE-only keys, and that passed in a EE pipeline since Gitlab::UsageData is prepended with EE::Gitlab::UsageData there, but not in CE. This fixes that.

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation created/updated or follow-up review issue created
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Performance 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

Closes #33210 (closed)