[Backport 2.10] Fetching timezone from ui settings for Trigger context formatting

[opensearch-trigger-bot[bot]]

Backport 0c13bae923cacccb0c9c6b482bb197428c7ad146 from #913.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 49.83%. Comparing base (9c331f7) to head (2ef81b8).

Additional details and impacted files

@@            Coverage Diff             @@
##             2.10     #925      +/-   ##
==========================================
+ Coverage   49.80%   49.83%   +0.02%     
==========================================
  Files         233      233              
  Lines        6565     6568       +3     
  Branches      938      939       +1     
==========================================
+ Hits         3270     3273       +3     
  Misses       3292     3292              
  Partials        3        3              

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