Allow multiple badges to be displayed on the timeline events list

What does this MR do and why?

• Allow all selected tags for a specific event to be displayed on the timeline

Screenshots or screen recordings

before	after

How to set up and validate locally

1. Open the Rails Console in a terminal under the gitlab/ folder: rails c
2. Run Feature.enable(:incident_event_tags) to enable to feature globally for your GitLab instance.
3. Navigate to Monitor > Incidents page
4. Create new or open an existing incident
5. Navigate to Timeline tab of the incident
6. Click "Add new timeline event" button at the bottom
7. Choose more than one tag from a dropdown
8. Save the changes

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 #373854 (closed)