refactor: move hermetic Python runtime setup into macro #2221
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This stems from conversation in #2216. Moving the logic into a loading-phase macro makes it
easier to understand how a repo with a python-build-standalone extracted archive has
its toolchain defined. This also makes it easier to compare with the local runtime repo
setup to try and find commonality in the future.
Along the way:
(Bazel 5 support was dropped earlier this year and we stopped testing with it; it's
likely already broken with Bazel 5).
semver.to_dict
, which makes it easier to pass into format() functions.