refactor: have bzlmod pass platforms to python_register_toolchains #2884
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This is to facilitate eventually allowing overrides to add additional platforms.
Instead of the PLATFORMS global being used, the python bzlmod extension passing the
mapping directly to python_register_toolchains, then receives back the subset of
platforms that had repos defined. That subset is then later used when (re)constructing
the list of repo names for the toolchains.