Copy additional editions proto for v27.x (#211)

This adds a step to our CI config to copy the new
`test_messages_edition2023.proto` into our release binary.

Note that we copy this to `include/google/protobuf` rather than
mirroring its directory of `conformance/test_protos`. This is to keep
all the `test_messages*.proto` files together in one directory.

.github/workflows/release.yaml

@@ -78,6 +78,7 @@ jobs:
           mkdir -p .tmp/include/conformance
           mkdir -p .tmp/include/google/protobuf
           cp ./protobuf-${{ needs.get-protobuf.outputs.version }}/conformance/conformance.proto .tmp/include/conformance
+          cp ./protobuf-${{ needs.get-protobuf.outputs.version }}/conformance/test_protos/test_messages*.proto .tmp/include/google/protobuf
           cp ./protobuf-${{ needs.get-protobuf.outputs.version }}/src/google/protobuf/test_messages*.proto .tmp/include/google/protobuf
 
       - name: Zip Binary
@@ -143,6 +144,7 @@ jobs:
           mkdir -p .tmp/include/conformance
           mkdir -p .tmp/include/google/protobuf
           cp ./protobuf-${{ needs.get-protobuf.outputs.version }}/conformance/conformance.proto .tmp/include/conformance
+          cp ./protobuf-${{ needs.get-protobuf.outputs.version }}/conformance/test_protos/test_messages*.proto .tmp/include/google/protobuf
           cp ./protobuf-${{ needs.get-protobuf.outputs.version }}/src/google/protobuf/test_messages*.proto .tmp/include/google/protobuf
 
       - name: Zip Binary