Change shared_runner_limit_block to use frontend helper utils

What does this MR do?

This changes the use of the runnersHelpPath data attribute from HAML and uses the helpPagePath utility from javascript

#300692 (closed)

Screenshots (strongly suggested)

N/A

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