feat: add method to get message portal container

[yuhongz]

close #xxx

Pull Request Checklist

• Related tickets or issues have been linked in the PR description (or missing issue).
• Naming convention is followed (do please check it especially when you created new plugins, commands and resources).
• Unit tests have been added for the changes (if applicable).
• Breaking changes have been documented (or no breaking changes introduced in this PR).

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 26.30%. Comparing base (26af2cc) to head (e52ec50).
Report is 1 commits behind head on dev.

Files	Patch %	Lines
...ui/src/services/message/desktop-message.service.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2775      +/-   ##
==========================================
- Coverage   26.31%   26.30%   -0.01%     
==========================================
  Files        1704     1706       +2     
  Lines       91247    91392     +145     
  Branches    19311    19345      +34     
==========================================
+ Hits        24008    24045      +37     
- Misses      67239    67347     +108     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[github-actions]

View Deployment

#9949693515

🥐 🍔 🥓 🥗 🥘 🌯 🍚 🍛 🍖 🍭 🍧 🍝 🥪 🥖 🍪
Still cooking, please come back later
🥙 🥮 🥨 🌭 🍦 🍙 🍕 🍰 🍮 🍜 🍡 🍱 🍿 🍕 🥟