Update the time_ago_tooltip component to support custom text

What does this MR do?

This MR updates the time_ago_tooltip component to accept a default scope.

This scope has knowledge of the timeAgo value.

This now means we can customise the tooltip text for every context. If the scope isn't used, it defaults to what it does now: return the timeago value.

Implementation example

This came from a need to customise the tooltip output for the Compliance dashboard. An implementation MR for this change, showing it works is here: !38909 (merged)

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

Add the time_ago_tooltip component to an existing component (or use one you already know of). Add the default scope and confirm it is displayed correctly.

• 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

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• [-] Label as security and @ mention @gitlab-com/gl-security/appsec
• [-] The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• [-] Security reports checked/validated by a reviewer from the AppSec team

Related #227809 (closed)