Revert "move caffe2/proto/ to its own Bazel package (#97324)"
This reverts commit 6273c0af9513895f0597ae1801f37164d7b46d2a.
Reverted https://github.com/pytorch/pytorch/pull/97324 on behalf of https://github.com/malfet due to Reverting as PR dependent on https://github.com/pytorch/pytorch/pull/97322 that has been reverted
