Track events on requirements page frontend

What does this MR do?

Related to https://gitlab.com/gitlab-org/product-analytics/-/issues/370

Tracks events on Requirements page:

Action	Event	Label	Property
Navigate to previous page	click_navigation	prev	empty
Navigate to next page	click_navigation	next	empty
Filter with search bar	filter	empty	[ {"type":"filtered-search-term","value":{"data":"requirement title"}}, {"type":"author_username","value":{"data":"john.doe","operator":"="}} ]

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

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