Add changed pages to visual review modal

What does this MR do?

Related to #27227 (closed)

Route Maps are used to add a quick navigation dropdown to the review app link on a MR so that the user can see which pages were changed and go directly there. We want the visual review modal (also on the MR page) to have this same functionality. This MR implements that functionality.

Two other small bugs that are fixed in this MR in the process:

• MR ID was not showing up in the modal
• There was a copy error that was mentioning a step 5 in the modal, even though there was a step removed a couple months ago.

Screenshots

Before	After

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

Closes #27227 (closed)