FindChangedPaths: Add old_mode and new_mode fields
git diff-tree
outputs a line for each changed path that contains the old and new Unix file modes of the path in octal format. Extract these old and new modes and pass them in the FindChangedPaths
RPC response.
This depends on !4591 (closed) !4597 (merged), and is needed to implement my vision for gitlab#342703 (comment 961132464).
Edited by Kyle Edwards