Via ./api/migration/v3alpha.sh. This picks up the changes since the last
sync, in particular the major reformat in #8309.
Risk level: Low (not used yet).
Testing: bazel build @envoy_api//...
Signed-off-by: Harvey Tuch <htuch@google.com>
Mirrored from https://github.com/envoyproxy/envoy @ c41cfbf6a33b8115a7e29a2b4a926aad4cd062be