python: make incompatible_python_disallow_native_rules work for top-level external repo targets #20516
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This basically makes it usable with the downloaded runtimes rules_python makes available,
which reference their runtimes as e.g.
@python_3_11//:python.The issue was the code to construct the label was leaving a trailing "/" when the the target being checked at the root of the workspace. To fix, just omit the trailing slash when the package name is empty to prevent the trailing slash.
Work towards #17773