Refactor meta operation class to use _name property and update name logic

[EH-MLS]

The AsyncOperation base class should be refactored as follows:

• The abstract property name should be renamed to _name, and subclasses should implement _name instead of name.
• The public property name should be implemented in the base class and return the string 'git/foldername' + _name, where foldername is the name of the root git repo / directory.
• Update all subclasses and usages to override and use _name.
• Ensure all references to name in subclasses are updated to _name.
• all tests are passing

This will improve encapsulation and clarify the intended usage of the operation name in meta operations.