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5bfcd3ff - Show the offending URL in Python mirror errors (#22364)

Show the offending URL in Python mirror errors (#22364) When a Python download URL does not match the upstream format expected by a custom mirror, the error repeats the mirror environment variable instead of showing the offending URL. Display the URL in that diagnostic and store it as a `DisplaySafeUrl` so passwords and sensitive query parameters are redacted. Malformed source URLs use the existing `InvalidUrl` error. Co-authored-by: zaniebot <242828183+zaniebot@users.noreply.github.com>