test: Fix test_config.py fails when variables are set externally in the environment #3621
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Short description of the problem this fixes or functionality that this introduces. This may be used for the CHANGELOG
Fixes: #3572
Mocked env variables to fix the failing tests.
Give a summary of what the PR does, explaining any non-trivial design decisions
We were expecting the value of LLM_MODEL to be None, so I just deleted that env if it is set externally using monkey patch. This will fix the issue of this variable getting set externally and failing the tests.
Link of any specific issues this addresses
#3572