Add unit test for LLM dump_debug method

[aniketmaurya]

Before submitting

• Was this discussed/agreed via a Github issue? (no need for typos and docs improvements)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

Users will get tested code.

• Added a new test, test_dump_debug, to validate the functionality of the LLM's _dump_debug method.
• The test verifies that the method correctly creates a log file, writes the expected content, and handles exceptions appropriately.

PR review

Anyone in the community is free to review the PR once the tests have passed.
If we didn't discuss your PR in GitHub issues there's a high chance it will not be merged.

Did you have fun?

Make sure you had fun coding 🙃

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88%. Comparing base (40e69c9) to head (f2dc56e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@        Coverage Diff         @@
##           main   #23   +/-   ##
==================================
+ Coverage    81%   88%   +7%     
==================================
  Files         6     6           
  Lines       333   333           
==================================
+ Hits        269   292   +23     
+ Misses       64    41   -23     

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