fix: normalize argv0 so runfiles root can be found on windows with bazel 9 (#2481) When the shell test invokes the python binary, it uses a combination of forward slashes and backslashes. Under Bazel 9, that mixture of slashes is preserved. This later breaks a regex that looks for the OS-specific path separator. To fix, normalize forward slashes to the OS path separator. Oddly, it's not Bazel that is passing the mixture of slashes (it's the shell), but behavior seems to vary based on which version of Bazel is used. Along the way, copy the nicer `print_verbose` function from the stage2 bootstrap into the old bootstrap. It prints debug information in a nicer format. Work towards https://github.com/bazelbuild/rules_python/issues/2469
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