fix: Add last interval to BetweenTwoTriggersEvalStrategy

[robinholzi]

Motivation

As for the time after the last training there's no more training hence the time is not covered in an eval interval, we need to handle this case manually

[codecov]

Codecov Report

Attention: Patch coverage is 90.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 85.73%. Comparing base (73b487c) to head (56e4914).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...r/internal/eval/strategies/between_two_triggers.py	80.00%	1 Missing ⚠️
...or/internal/pipeline_executor/pipeline_executor.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #618      +/-   ##
==========================================
- Coverage   85.73%   85.73%   -0.01%     
==========================================
  Files         258      258              
  Lines       11248    11254       +6     
==========================================
+ Hits         9644     9649       +5     
- Misses       1604     1605       +1     

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[github-actions]

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