Add python to Spell Check dictionaries.

[Lonanche]

Some words like 'venv' or 'pylint' are not in the python dictionary so they are still gonna show up as a spell error.

Closes #18674

[ghost]

Thank you for your contribution Lonanche! We will review the pull request and get back to you soon.

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[danieljurek]

/azp run python - core - ci

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[danieljurek]

Manual CI run succeeded -- https://dev.azure.com/azure-sdk/public/_build/results?buildId=977781&view=results

[danieljurek]

/check-enforcer override