Add test report usage ping metrics

What does this MR do?

Related to #235524 (closed)

In a previous MR we added a usage ping event for when a user looks at the test report MR widget. However, we missed adding YAML metrics definitions for each of the events. This MR adds them.

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 the events were added in a previous MR and this is a developer change.
• [-] 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