fix: fixed UI issues of discussion for incontext sidebar

[sundasnoreen12]

INF-1184

Description

fixed UI issues of discussion for incontext sidebar based on Figma Legacy Notifications vs Discussions Sidebar.

Screenshots/sandbox (optional):

Merge Checklist

• If your update includes visual changes, have they been reviewed by a designer? Send them a link to the Sandbox, if applicable.
• Is there adequate test coverage for your changes?

Post-merge Checklist

• Deploy the changes to prod after verifying on stage or ask @openedx/edx-infinity to do it.
• 🎉 🙌 Celebrate! Thanks for your contribution.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (b5d036a) 92.41% compared to head (385b5d7) 92.41%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #633   +/-   ##
=======================================
  Coverage   92.41%   92.41%           
=======================================
  Files         169      169           
  Lines        3468     3468           
  Branches      900      900           
=======================================
  Hits         3205     3205           
  Misses        243      243           
  Partials       20       20           

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[ayesha-waris]

PR LGTM