Replace Owlbot (owlbot copy-code) in hermetic build

[JoeWang1127]

In hermetic build, Owlbot is used to copy pre-processed library to its final destination for post-processing. It needs a configuration file, .OwlBot-hermetic.yaml to specify how to copy generated files to the destination.

The configuration cause some confusion, e.g., after adding a module in a library, we also need to modify the configuration so that Owlbot can copy the newly generated module to its destination (commit).

In addition, we need to install npm, nodejs and git in the docker image to support Owlbot, which may introduce security vulnerabilities.

We should replace Owlbot copy-code function with our own implementation and remove the configuration file.

Note that Owlbot has more functions and handwritten libraries may contain customizations, we need to support them as well.