fix(messagesStore): don't update parent message in the store, if it hasn't been unchanged

[Antreesy]

☑️ Resolves

• Fix excessive store updates:
  • When first time loading the chat, we already have the parent message up-to-date from the API
  • message_deleted, message_edited, reaction... requested at the same time (not new) contains same parent message without changes, so we don't need to update it again and trigger sideEffect (messagesList re-render)
  • deleteMessage, editMessage, addReaction API requests return parent to update it. When it comes again with message long polling, we also don't need to update it

🖌️ UI Checklist

🖼️ Screenshots / Screencasts

No visual changes

🏁 Checklist

• 🌏 Tested with Chrome, Firefox and Safari or should not be risky to browser differences
• ⛑️ Tests are included or not possible

[DorraJaouad]

Makes sense