Feature-122: _untag_object

[doulikecookiedough]

Summary of Changes:

• Refactored tag_object to call a new method, _store_hashstore_refs_files, re-raising specific exceptions.
• Added and used new synchronization locks to ensure thread safety in tag_object
• Implemented _store_hashstore_refs_files to handle unexpected exceptions by calling _untag_object while swallowing expected ones.
• _untag_object now reverts the tagging process as much as possible, with new supporting methods for clarity.
• Extracted synchronization code for improved readability.
• Renamed exceptions for clarity, introduced new custom exceptions, and enhanced logging for debugging.
• Cleaned up test modules and organized code for better structure (this will be reviewed more closely in the release prep PR).
• Added new pytests and fixed bugs discovered during the process

Side Note:

• I used the word "functions" and "methods" in my commit messages a little absentmindedly, these commits should have been "methods" (ex. a method belongs to a class while a function stands alone).