regression: DiscussionsList title missing style

[dougfabris]

Proposed changes (including videos or screenshots)

Introduced here: #31978
Due to some changes in the semantics of Contextualbar the discussion list wasn't using the proper component so it lost the style.
Adding the proper component for the title fixes the issue!

Issue(s)

Steps to test or reproduce

Further comments

CORE-226

[changeset-bot]

🦋 Changeset detected

Latest commit: ee1b037

The changes in this PR will be included in the next version bump.

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[codecov]

Codecov Report

Attention: Patch coverage is 21.27660% with 37 lines in your changes are missing coverage. Please review.

Project coverage is 52.97%. Comparing base (d951e63) to head (867ab1f).

❗ Current head 867ab1f differs from pull request most recent head ee1b037. Consider uploading reports for the commit ee1b037 to get more accurate results

Additional details and impacted files

@@                Coverage Diff                @@
##           release-6.7.0   #32103      +/-   ##
=================================================
- Coverage          54.74%   52.97%   -1.78%     
=================================================
  Files               2299     2242      -57     
  Lines              50738    49475    -1263     
  Branches           10380    10041     -339     
=================================================
- Hits               27779    26209    -1570     
- Misses             20491    20881     +390     
+ Partials            2468     2385      -83     

Flag	Coverage Δ
e2e	50.36% <33.33%> (-3.35%)	⬇️
e2e-api	40.08% <13.51%> (-0.08%)	⬇️
unit	75.80% <75.00%> (-0.01%)	⬇️

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[yash-rajpal]

LGTM!