Python: If no env_file is configured then default to relative .env file #6754
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Motivation and Context
We'd like to improve the handling of the .env file related to Pydantic Settings. If Environment variables aren't found, it's possible to fall back on reading the values from a .env file.
Description
Previous to this PR, that is done by specifying the .env file path. Now, if the env_file is not specified, we will default to reading from the relative ".env" file in the cwd.
Contribution Checklist