Fix add_follower CLI command to properly handle --user global flag

[obenland]

Proposed changes:

• Fixed the add_follower CLI command to properly handle the --user global flag by using get_current_user_id() instead of manually parsing the flag
• Removed unused Actors import

The command was incorrectly trying to manually handle the --user flag through $assoc_args. Since --user is a WP-CLI global flag, it's automatically handled by WP-CLI which sets the current user context before command execution.

Other information:

• Have you written new tests for your changes, if applicable?

Testing instructions:

1. Run wp activitypub add_follower https://example.com/@user --user=1
2. Verify the follower is added to user ID 1
3. Run wp --user=2 activitypub add_follower https://example.com/@another
4. Verify the follower is added to user ID 2 (using the alternative global flag syntax)

[Copilot]

Pull Request Overview

Fixes the add_follower CLI command to correctly use WP-CLI's global --user flag by leveraging get_current_user_id() instead of manually parsing the flag from command arguments.

• Replaced manual --user flag parsing with get_current_user_id() to respect WP-CLI's automatic user context handling
• Removed unused Actors import that was only needed for the now-removed default value
• Simplified function signature by removing the unused $assoc_args parameter

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