Python: Fix pydantic alias issue

[john0isaac]

Motivation and Context

fix #10026

Description

This PR removes the alias as pydantic requires the usage of the alias when initializing the class not the original name which prevents this code from working.

cosmosdb_settings = AzureCosmosDBSettings.create(
                env_file_path=env_file_path,
                connection_string=cosmos_connstr,
            )

Contribution Checklist

• The code builds clean without any errors or warnings
• The PR follows the SK Contribution Guidelines and the pre-submission formatting script raises no violations
• All unit tests pass, and I have added new tests where possible
• I didn't break anyone 😄