feat: Add scrollbar in unscheduled sessions

[iamareebjamal]

Fixes #4166

[vercel]

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[codecov]

Codecov Report

Merging #4793 into development will increase coverage by 0.13%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           development    #4793      +/-   ##
===============================================
+ Coverage        23.16%   23.30%   +0.13%     
===============================================
  Files              480      481       +1     
  Lines             5051     5064      +13     
  Branches            14       15       +1     
===============================================
+ Hits              1170     1180      +10     
- Misses            3879     3881       +2     
- Partials             2        3       +1     

Impacted Files	Coverage Δ
app/utils/color.ts	80.00% <0.00%> (ø)
app/components/schedule.ts	48.14% <0.00%> (+0.14%)	⬆️
app/components/scheduler/unscheduled-session.js	80.00% <0.00%> (+2.22%)	⬆️

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