Refactor MR FE components to rely on DiffViewer instead of DiffFile

What does this MR do?

This MR adds a new part of logic behind DiffViewer Vue component to utilize DiffViewer instead of Diff::File.

List of replaced properties:

• collapsed
• too_large
• empty
• text
• mode_changed

Properties still required on FE side:

For computing LFS badge visibility

• stored_externally
• external_storage

For displaying correct tree list and to be used in ImageViewer to calculate image path:

• new_file
• renamed_file
• deleted_file

What are the relevant issue numbers?

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer

Closes #55932 (closed)