fix(chatManager): Expire unread cache on message delete

[Souptik2001]

☑️ Resolves

• Fix Unread mention notification does not go away if the message in question has been deleted #13286

Demo -

Before

Just as with the screencast below, the difference is that the unread message doesn't disappear even after refreshing the page.

After

Screen.Recording.2024-09-20.at.1.59.20.AM.mov

🖌️ UI Checklist

🖼️ Screenshots / Screencasts

🚧 Tasks

• ...

🏁 Checklist

• 🌏 Tested with different browsers / clients:
  • Chromium (Chrome / Edge / Opera / Brave)
  • Firefox
  • Safari
  • Talk Desktop
  • Not risky to browser differences / client
• 🖌️ Design was reviewed, approved or inspired by the design team
• ⛑️ Tests are included or not possible
• 📗 User documentation in https://github.com/nextcloud/documentation/tree/master/user_manual/talk has been updated or is not required

---

🛠️ API Checklist

🚧 Tasks

• ...

🏁 Checklist

• ⛑️ Tests (unit and/or integration) are included or not possible
• 📘 API documentation in docs/ has been updated or is not required
• 🔖 Capability is added or not needed

[nickvergessen]

/backport to stable30

[nickvergessen]

/backport to stable29

[nickvergessen]

/backport to stable28

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