Fix integration test and bug in load balancer wait logic

[pankajastro]

I noticed that sometimes dag.test() does not raise an exception even when an Airflow task fails, leading to silent failures in CI jobs without any notification. To address this, I’ve added an explicit assertion to check that the DAG run state is "success" when dag.test() does not raise an exception.

Added the tool.pytest.ini_options section in pyproject.toml, including the minversion option and custom markers.

Fixed bug in the sleep logic while waiting for the load balancer to become ready

Failed detected CI: https://github.com/astronomer/astro-provider-ray/actions/runs/11560564529/job/32177695161?pr=85

closes: https://github.com/astronomer/oss-integrations-private/issues/22

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.22%. Comparing base (0d99128) to head (c80556e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #85      +/-   ##
==========================================
+ Coverage   96.09%   98.22%   +2.13%     
==========================================
  Files           5        5              
  Lines         563      564       +1     
==========================================
+ Hits          541      554      +13     
+ Misses         22       10      -12     

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