Fix git and api calls

[tmetzl]

This pull request includes several changes to the e2xauthoring and packages directories to improve path handling, refactor code, and enhance functionality. The most important changes include updating path handling to use os.path.realpath, refactoring the Task class, and adding a callback to the SetGitAuthorDialog component.

Path Handling Improvements:

• e2xauthoring/models/pool.py: Updated the path attribute in the Pool class to use os.path.realpath for resolving the absolute path.
• e2xauthoring/models/task.py: Updated the path attribute in the Task class to use os.path.realpath for resolving the absolute path.

Refactoring:

• e2xauthoring/models/task.py: Refactored the copy method in the Task class to use a new _rename_notebook helper method for renaming notebooks.

API Changes:

• packages/api/src/api.js: Modified the rename and copy methods in the API object to change the parameter name from old_name to name.

Component Enhancements:

• packages/app/src/components/alerts/GitAuthorNotSetAlert.jsx: Added a new handleAuthorSet function to update the state when the Git author is set.
• packages/app/src/components/dialogs/SetGitAuthorDialog.jsx: Added an onAuthorSet callback to the SetGitAuthorDialog component to notify when the Git author is set. [1] [2]