infra/proto: remove uprev_message to UprevPackageResponse proto

Now that ChromeOS garderner dashboard do display the Chrome uprrev commit diffs,
there is no longer the need to add the diff link to uprrev CL. Removing this proto
to simplify code.

Bug:chromium:1019835
Change-Id: Ife789d9df13f8af2f0251172a43a24b08fa11144
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/1990520
Reviewed-by: Sean Abraham <seanabraham@chromium.org>
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Tested-by: Ned Nguyen <nednguyen@google.com>
3 files changed