Don't generate security configuration paths in FOSS [RUN AS-IF-FOSS]

What does this MR do?

This fixes an issue that broke FOSS as we attempted to generate a link for a feature that is only available in EE.

• The hash to be passed down to the Vue app has been moved out of the HAML and into a helper module.
• An EE override is now responsible for adding the EE-only link to the hash.
• Added specs for the helper and its override.

Does this MR meet the acceptance criteria?

Conformity

• 📋 Does this MR need a changelog?
  • [-] I have included a changelog entry.
  • I have not included a changelog entry because this fixes an unreleased issue.
• [-] 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

Related to #327275 (closed)