test: ignore diff error for sending email report

[hellyzh]

No description provided.

[Copilot]

Pull Request Overview

This PR improves error handling in the UI test workflow when calculating duration for email reports. It adds validation and error suppression to prevent failures when processing timestamp data.

• Enhanced validation to check for malformed timestamp data before processing
• Added error suppression and fallback handling for the dateutils.ddiff command
• Improved robustness of the duration calculation logic

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.04%. Comparing base (2df6478) to head (e8c878a).
⚠️ Report is 3 commits behind head on dev.

Additional details and impacted files

@@           Coverage Diff            @@
##              dev   #14410    +/-   ##
========================================
  Coverage   90.03%   90.04%            
========================================
  Files         650      650            
  Lines       38924    38924            
  Branches     7675     7807   +132     
========================================
+ Hits        35046    35048     +2     
+ Misses       1759     1758     -1     
+ Partials     2119     2118     -1     

see 2 files with indirect coverage changes

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