Fix file upload path when parent directories have spaces

Issue Description: When a user uploads a syllabus under Courses, the backend creates a file path that may contain spaces. The final file path can incorrectly remove these spaces, causing the application to save the file to a nonexistent directory and resulting in a No such file or directory error.

Update the file path creation logic so that spaces in directory names are preserved when constructing upload paths.

Expected Behavior: Files should upload successfully even when the application or upload directory path contains spaces.

Search the backend for the file upload path creation logic and reproduce the upload with a parent directory containing spaces. Preserve those spaces when constructing the path, then verify that a syllabus uploads successfully and no No such file or directory error occurs.

Written by the indexing model from the issue text.