Go: CD pipeline improvements

[jamesx-improving]

In the Go CD pipeline, we generate 3 different type of files, and add them to the repository on an isolated tag, during a go client release:

• Binary files compiled from our rust code (*.a)
• Header file auto-generated by cbindgen (lib.h)
• Protobuf auto-generated go files (*.pb.go)

Only the first type of files are platform-dependent, hence need to be generated and upload on their respective platforms, but the latter two types are not.

Currently all 3 types of files are generated and uploaded on all platforms. This could be optmized by moving the generation of the latter 2 types of files to a non-matrix job, or conditionally in only one of the matrix runner, so the files won't be generated from other platforms, which got thrown away eventually.