#24938 Add option to disable strict X509 verification

Adds an option to disable strict X.509 certificate verification in the generated Python client.

Changes

• Added disable_strict_ssl_verification to the Python Configuration template.
• Added the corresponding constructor parameter.
• Added documentation for the new option.

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Summary by cubic

Adds an option to disable strict X.509 certificate verification in the generated Python client. Configuration now accepts disable_strict_ssl_verification (default False), and the sync, asyncio, and httpx REST clients honor it. Turning it on relaxes verification and lowers transport security; use it only when necessary. Existing verify_ssl behavior is preserved when strict verification is disabled.