added new file test_fileMetadata.py

[Sai-ganesh-0004]

Description
This pull request introduces new tests for the FileMetadata class in the twinTrim/dataStructures module. The tests cover various scenarios to ensure the correct behavior of the insert_file method.

New tests added:

• test_insert_new_file: Verifies that a new file can be successfully inserted into the metadata. (twinTrim/dataStructures/test_fileMetadata.py)
• test_insert_duplicate_file: Ensures that attempting to insert a duplicate file does not add it again to the metadata. (twinTrim/dataStructures/test_fileMetadata.py)
• test_insert_multiple_files: Confirms that multiple different files can be inserted into the metadata without issues. (twinTrim/dataStructures/test_fileMetadata.py)
  This PR introduces a new test file test_fileMetadata.py to validate the insert_file method in the FileMetadata class. The purpose of this addition is to ensure the method works correctly for both new file insertions and duplicate file handling.

Fixes Issue: #7 Write Unit Tests for add_or_update_normal_file

Type of Change

• Tests update

Checklist

• [YES] My code follows the style guidelines of this project.
• [YES] I have performed a self-review of my own code.
• [YES] I have commented my code, particularly in hard-to-understand areas.
• [YES] My changes generate no new warnings.
• [YES] New and existing unit tests pass locally with my changes.
• [YES] I have maintained a clean commit history by using the necessary Git commands.
• [YES] I have checked that my code does not cause any merge conflicts.

[Sai-ganesh-0004]

In the code you can change the path

[Kota-Karthik]

@Sai-ganesh-0004
follow PR template , add issue number
move the code to tests/test_allFileMetadata.py
add screenshots so that we can verify test runs well without any failure

[Sai-ganesh-0004]

ok im on it