[feat][evaluation] increase the trimming length of text

[tpfz]

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[codecov]

Codecov Report

❌ Patch coverage is 93.10345% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...ules/evaluation/domain/service/expt_result_impl.go	90.47%	1 Missing and 1 partial ⚠️

@@           Coverage Diff           @@
##             main     #393   +/-   ##
=======================================
  Coverage   69.93%   69.94%           
=======================================
  Files         618      618           
  Lines       58621    58640   +19     
=======================================
+ Hits        40999    41014   +15     
- Misses      14637    14639    +2     
- Partials     2985     2987    +2     

Flag	Coverage Δ
unittests	69.94% <93.10%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
backend/modules/evaluation/pkg/utils/trim.go	95.09% <100.00%> (ø)
...ules/evaluation/domain/service/expt_result_impl.go	64.86% <90.47%> (+0.30%)	⬆️

... and 2 files with indirect coverage changes

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