Resolve "Memory usage notice doesn't link anywhere"

What does this MR do?

Adds a link in the MR Widget that takes you to the environment metrics dashboard when metrics are available (when the memory usage component shows basically)

Are there points in the code the reviewer needs to double check?

None at the moment

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Tests
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides

What are the relevant issue numbers?

Closes #34110 (closed)