fix(spanner): correct chrono arithmetic in Interval integration test

[prathmeshcc]

The integration test for Spanner Intervals previously used non chrono literal logic
for time additions. This commit updates the chrono arithmetic to ensure hermetic logic and uses chrono literals.

[gemini-code-assist]

Summary of Changes

Hello @prathmeshcc, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses an issue in the Spanner Interval integration test where time additions were not using correct chrono arithmetic. By updating the calculation for time intervals, such as ensuring an hour is precisely 3600 seconds, the change aims to eliminate flakiness and improve the accuracy of test results related to time-based operations.

Highlights

• Chrono Arithmetic Correction: Updated chrono arithmetic in the Spanner Interval integration test to ensure precise time calculations, specifically for adding time intervals like an hour.
• Test Flakiness Resolution: This change aims to resolve potential flakiness and inaccuracies in test results that were previously caused by incorrect time interval calculations.

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[gemini-code-assist]

Code Review

This pull request correctly identifies an area for improvement in an integration test by replacing a magic number for time duration with std::chrono arithmetic. However, the implementation introduces a new potential for test flakiness by making two separate calls to std::chrono::system_clock::now(). My review includes a suggestion to refactor this to use a single time point, which will make the test more reliable and the code cleaner.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.94%. Comparing base (d0dc97e) to head (53521db).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...r/integration_tests/data_types_integration_test.cc	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15810      +/-   ##
==========================================
- Coverage   92.95%   92.94%   -0.02%     
==========================================
  Files        2458     2458              
  Lines      227589   227588       -1     
==========================================
- Hits       211561   211537      -24     
- Misses      16028    16051      +23     

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[mpeddada1]

/gemini review