Add redis hll user event tracking for resource link clicks on frontend

What does this MR do and why?

This MR implements frontend tracking for Linked resources feature.

Relates to #368597 (closed)

Screenshots or screen recordings

NA

How to set up and validate locally

1. Make sure you have GitLab Premium
2. Enable feature flag incident_resource_links_widget on rails console using `Feature.enable(:incident_resource_links_widget)
3. Open a project where you have atleast reporter permissions.
4. Open or create an incident in Monitor > Incidents
5. Check the Linked resources widget in the Summary tab.
6. Run Gitlab::UsageDataCounters::HLLRedisCounter.unique_events(event_names: 'incident_management_issuable_resource_link_visited', start_date: Date.current.beginning_of_week, end_date: Date.current.next_week) in the rails console.
7. Check that the value is 0.
8. Add a resource link from the UI on Linked resources section.
9. Click on that link. (It's fine if the link does not lead anywhere).
10. Run the command from step 6 again in the rails console.
11. See the value getting incremented from 0 to 1.

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #368597 (closed)