test(simint): clean up stale test models to prevent hitting limit

[mohammad-arif662]

Description

Adds a cleanup step in the seed_simulator_models fixture to delete leftover models from prior CI runs before creating a new one. It is to prevent it from hitting limit.

Checklist:

• Tests added/updated.
• Documentation updated. Documentation is generated from docstrings - these must be updated according to your change.
  If a new method has been added it should be referenced in cognite.rst in order to generate docs based on its docstring.
• The PR title follows the Conventional Commit spec.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 93.65%. Comparing base (e2152c0) to head (068aad9).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
...s_integration/test_api/test_simulators/conftest.py	50.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2704      +/-   ##
==========================================
- Coverage   93.68%   93.65%   -0.03%     
==========================================
  Files         503      503              
  Lines       50696    50704       +8     
==========================================
- Hits        47494    47488       -6     
- Misses       3202     3216      +14     

Files with missing lines	Coverage Δ
...s_integration/test_api/test_simulators/conftest.py	86.36% <50.00%> (-2.86%)	⬇️

... and 4 files with indirect coverage changes

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[gemini-code-assist]

Code Review

This pull request adds a cleanup mechanism to delete stale simulator models created more than two hours ago during integration tests. Feedback was provided to ensure type safety and prevent potential runtime errors by checking that created_time is not None before comparing it.

[vincent-cognite]

🦄