Fix host upcoming activites showing wrong created at date in tooltip

[ghernandez345]

For #27775

fixes an issue where the host upcoming activities were showing the incorrect created at dates in the tooltip.

• Changes file added for user-visible changes in changes/, orbit/changes/ or ee/fleetd-chrome/changes.
• Manual QA for all new/changed functionality

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 63.99%. Comparing base (9c9bffc) to head (5fa6a4c).
Report is 17 commits behind head on main.

Files with missing lines	Patch %	Lines
frontend/components/ActivityItem/ActivityItem.tsx	83.33%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #28242   +/-   ##
=======================================
  Coverage   63.99%   63.99%           
=======================================
  Files        1780     1780           
  Lines      170751   170757    +6     
  Branches     4886     4887    +1     
=======================================
+ Hits       109273   109278    +5     
- Misses      52862    52863    +1     
  Partials     8616     8616           

Flag	Coverage Δ
frontend	52.45% <83.33%> (+0.01%)	⬆️

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