Auto merge of #29913 - mrobinson:mach-unicode-paths, r=atbrakhi

Allow building on paths with Unicode characters

This now works since the upgrade to Python 3, so we can remove
this code which prevents mach from running in these situations.

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- [x] `./mach build -d` does not report any errors
- [x] `./mach test-tidy` does not report any errors
- [x] These changes fix #10002.
- [x] These changes do not require tests because they just change build scripts.

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