feat: Pick local timezone for online events by default

[iamareebjamal]

Fixes #5015

[vercel]

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[codecov]

Codecov Report

Merging #5024 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #5024   +/-   ##
============================================
  Coverage        22.69%   22.69%           
============================================
  Files              485      485           
  Lines             5165     5165           
  Branches            21       21           
============================================
  Hits              1172     1172           
  Misses            3989     3989           
  Partials             4        4           

Impacted Files	Coverage Δ
app/components/widgets/time-zone-picker.ts	33.33% <ø> (ø)

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