Fix bug where clicking file header in diff refreshes page

What does this MR do?

Scroll to diff file when clicking on file name

• Add an ID to the diff content
• handle clicking on file name in diffFileHeader when it is not a link to another page but rather a link to an element on the page

What are the relevant issue numbers?

Closes #57669 (closed)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the style guides
• Security reports checked/validated by reviewer