Fix `ComputeSession().upload()` creating malformed filenames when using relative paths with parent directory references

[seedspirit]

Summary  

When using the upload() function with relative basedir paths containing parent directory references (e.g., ./, ../, ../../), the uploaded files have malformed names that include encoded directory traversal characters, making them difficult to identify and use.

!스크린샷 2025-05-28 오전 11.56.23.png|width=920,height=92,alt="스크린샷 2025-05-28 오전 11.56.23.png"!

Steps to Reproduce  

def test():
    with Session() as session:
        result = (session
                  .VFolder(name="test_folder")
                  .upload(sources=["manager.toml"]
                          ,basedir="../../")
        )
        print(result)


if __name__ == "__main__":
    test()

Expected Behavior  

• Files should be uploaded with their original filenames regardless of the basedir used
• Relative paths with parent directory references should be properly resolved without affecting the final filename