feat(python-sdk): remove client side validation from python sdk

[GMorris-professional]

This PR removes all traces of client side validation from the Python SDK. This excludes validation of required keys but rather focuses on validation of the attributes of the values themselves (e.g. maxLength, minLength etc.)

Description

• Removed all contents of hasValidation block in config/clients/python/template/model.mustache
• Removed all contents of hasValidation block in config/clients/python/template/src/api.py.mustache
• Removed all traces of disabled_client_side_validations from config/clients/python/template/src/configuration.py.mustache
• Removed assertions and tests for disabled_client_side_validations from config/clients/python/template/test/configuration_test.py.mustache

References

openfga/sdk-generator#450

Review Checklist

• I have clicked on "allow edits by maintainers".
• I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• The correct base branch is being used, if not main
• I have added tests to validate that the change in functionality is working as expected

If you haven't done so yet, we would appreciate it if you could star the OpenFGA repository. :)

[rhamzeh]

This is great @GMorris-professional!