fix: rebuild protobuf code and update ffi callsite (#4685)
### Description
Not quite sure how this got in, but I think the generated Go protobuf
code got out of sync.
This PR is the result of `make turborepo-ffi-proto` on main and then
fixing the build error caused by trying to construct `ChangedFilesReq`
with a `*string` instead of a `string` in the `ToCommit` field
### Testing Instructions
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