fix: utf8 encoding (#2555)

# Description

Delete the replacement of non ASCII characters into spaces

## Checklist before requesting a review

Please delete options that are not relevant.

- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my code
- [ ] I have commented hard-to-understand areas
- [ ] I have ideally added tests that prove my fix is effective or that
my feature works
- [x] New and existing unit tests pass locally with my changes
- [x] Any dependent changes have been merged

## Screenshots (if appropriate):

backend/packages/files/parsers/common.py

@@ -1,5 +1,4 @@
 import os
-import re
 import tempfile
 import time
 
@@ -84,8 +83,6 @@ async def process_file(
             doc.page_content = f"Filename: {new_metadata['original_file_name']} Content: {doc.page_content}"
 
             doc.page_content = doc.page_content.replace("\u0000", "")
-            # Replace unsupported Unicode characters
-            doc.page_content = re.sub(r"[^\x00-\x7F]+", " ", doc.page_content)
 
             len_chunk = len(enc.encode(doc.page_content))