fix: resolve issue with txt file type handling (#1697)

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## Description
Remove custom text file resolution, it sometimes wrongly marks other
file types as txt

## Type of Change
<!-- Please check the relevant option -->
- [ ] Bug fix (non-breaking change that fixes an issue)
- [ ] New feature (non-breaking change that adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)
- [ ] Documentation update
- [x] Code refactoring
- [ ] Performance improvement
- [ ] Other (please specify):

## Screenshots/Videos (if applicable)
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## Pre-submission Checklist
<!-- Please check all boxes that apply before submitting your PR -->
- [ ] **I have tested my changes thoroughly before submitting this PR**
- [ ] **This PR contains minimal changes necessary to address the
issue/feature**
- [ ] My code follows the project's coding standards and style
guidelines
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] I have added necessary documentation (if applicable)
- [ ] All new and existing tests pass
- [ ] I have searched existing PRs to ensure this change hasn't been
submitted already
- [ ] I have linked any relevant issues in the description
- [ ] My commits have clear and descriptive messages

## DCO Affirmation
I affirm that all code in every commit of this pull request conforms to
the terms of the Topoteretes Developer Certificate of Origin.

cognee/infrastructure/files/utils/guess_file_type.py

@@ -22,42 +22,6 @@ class FileTypeException(Exception):
         self.message = message
 
 
-class TxtFileType(filetype.Type):
-    """
-    Represents a text file type with specific MIME and extension properties.
-
-    Public methods:
-    - match: Determines whether a given buffer matches the text file type.
-    """
-
-    MIME = "text/plain"
-    EXTENSION = "txt"
-
-    def __init__(self):
-        super(TxtFileType, self).__init__(mime=TxtFileType.MIME, extension=TxtFileType.EXTENSION)
-
-    def match(self, buf):
-        """
-        Determine if the given buffer contains text content.
-
-        Parameters:
-        -----------
-
-            - buf: The buffer to check for text content.
-
-        Returns:
-        --------
-
-            Returns True if the buffer is identified as text content, otherwise False.
-        """
-        return is_text_content(buf)
-
-
-txt_file_type = TxtFileType()
-
-filetype.add_type(txt_file_type)
-
-
 def guess_file_type(file: BinaryIO) -> filetype.Type:
     """
     Guess the file type from the given binary file stream.

cognee/infrastructure/loaders/LoaderEngine.py

@@ -1,6 +1,7 @@
 import filetype
 from typing import Dict, List, Optional, Any
 from .LoaderInterface import LoaderInterface
+from cognee.infrastructure.files.utils.guess_file_type import guess_file_type
 from cognee.shared.logging_utils import get_logger
 
 logger = get_logger(__name__)
@@ -80,7 +81,7 @@ class LoaderEngine:
         """
         from pathlib import Path
 
-        file_info = filetype.guess(file_path)
+        file_info = guess_file_type(file_path)
 
         path_extension = Path(file_path).suffix.lstrip(".")