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4d9c8615 - Update code page to 65001 before setting environment variables, fix #11828 (#11831)

Update code page to 65001 before setting environment variables, fix #11828 (#11831) ## Summary When executing `.venv\Scripts\activate` in `cmd`, the script uses the local codepage for execution. This causes issues when the file path contains non-ASCII characters, resulting in corrupted environment variables such as `VIRTUAL_ENV`. See #11828. Code used to fix the issue was adapted from https://github.com/python/cpython/blob/3.13/Lib/venv/scripts/nt/activate.bat#L3-L9. ## Test Plan Before:  After:  (`chcp` command cleared the history lol)