fix(toolchains): Add Xcode repo env vars to local_runtime_repo for better cache invalidation (#3203) On macOS, if one writes a `local_runtime_repo` with `interpreter_path = "/usr/bin/python3"`, the path to python3 inside the selected _Xcode.app/Contents/Developer_ directory gets cached. If a developer changes that directory with `xcode-select --switch` that 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
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