[Bundle diff] Show diff directly

[mahalakshme]

As is:

Currently on click of Review button, we are taken to a page where we need to upload old Metadata file on the left and the new one on the right.

To be:

On click of Review button, it should directly show the list of files and the current org status is the old, and the uploaded to be considered new. Again user should not be in need to upload 2 files

[mahalakshme]

@petmongrels this is important but not priority among the other tasks, also less complex - so made it a good first issue for Adam to work on, have u already started working on this?

[petmongrels]

avniproject/avni-server@bd3e3fd