fix(whl_library): only add group machinery when it is needed (#1822) This removes the `alias` additions when the package groups are not used fixing alias that attempt to traverse the entire py_library dependency tree. I noticed that for some code that I want to write for `whl_library` having it explicit whether we are using groups or not in the `pip.parse` and or `whl_library` makes the code easier to understand and write. Fixes #1760
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