feat(toolchain): Add new make vars for Python interpreter path compliant with `--no_legacy_external_runfiles`#2772

aignas merged 2 commits intobazel-contrib:mainbazel-contrib/rules_python:mainfrom

FrankPortman:no_legacy_python_toolchainFrankPortman/rules_python:no_legacy_python_toolchainCopy head branch name to clipboard