fix(toolchains): Add Xcode repo env vars to local_runtime_repo for better cache invalidation #3203
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On macOS, if one writes a
local_runtime_repowithinterpreter_path = "/usr/bin/python3", the path to python3 inside the selected Xcode.app/Contents/Developer directory gets cached. If a developer changes that directory withxcode-select --switchthat cached file with the old directory remains.Making the local_runtime_repo rule sensitive to DEVELOPER_DIR and XCODE_VERSION (two conventionally adopted env vars among the Bazel + Apple ecosystem) will ensure that if Xcode changes, so will the resolved python3 path.
Fixes #3123