missing_enforced_import_rename: Do not enforce for underscores #16352
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Fixes #16150 , do not error when importing anonymously using an underscore.
In the issue it is suggested that perhaps there could be a flag to enable/disable this new behavior, but I don't see a strong case for disallowing "as _" when a rename was specified.
Please let me know if you think that flag would be useful and I can implement that on top.