Enable Anonymous Reactions and Remove Share Option for Changelog Updates

Description: Provide the option to configure anonymous reactions to changelog updates without requiring user sign-up, along with the ability to remove the "share" functionality for updates. Problem: Currently, users are required to sign up in order to leave reactions, which is unsuitable for platforms that already authenticate users, creating unnecessary friction. Additionally, the "share" function for changelog updates may not align with all organizations' preferences regarding user accessibility. Benefit: Allowing anonymous reactions will streamline user interaction and reduce barriers, especially on platforms that already use their own authentication systems. Additionally, providing configuration options to disable the share functionality ensures flexibility and better alignment with varying organizational requirements.