Activity feed bugs and improvements

[aniketkatkar97]

Affected module UI

Describe the bug

• [ ] Activity tab reloads when commented in the thread resetting the selected thread. Prevent the reload and only update the selected thread

https://github.com/open-metadata/OpenMetadata/assets/51777795/64b29095-8a3a-46dc-a62c-6bee7bad1238

• [ ] persona update feed

https://github.com/open-metadata/OpenMetadata/assets/71748675/678ae12b-c5a6-4ed3-855c-81f13fde8760

• [ ] plus minus icons should be center aligned.

Version:

• OS: [e.g. iOS]
• Python version:
• OpenMetadata version: [e.g. 0.8]
• OpenMetadata Ingestion package version: [e.g. openmetadata-ingestion[docker]==XYZ]

Additional context Add any other context about the problem here.