Fix UserProfile Custom Attributes casing

[justinabrokwah-okta]

Paginated results was re-formatting results before creating an object out of them to return through the method - in the case of user profile and custom attributes, custom attributes with a variable name starting with a capital letter, it would make the first letter lowercase instead

This PR removes that reformatting call thus resolving the issue

Used following code snippet to test and verify custom attributes are printed correctly:

# verify pagination issue is fixed
limit_params = {"limit": 1}
    users, resp, err = await okta_client.list_users(query_params=limit_params)
    for user in users:
        # print(user.id, user.profile.first_name, user.profile.last_name)
        print(user.profile)
    while resp.has_next():
        users, err = await resp.next()
        for user in users:
            # print(user.id, user.profile.first_name, user.profile.last_name)
            print(user.profile)

# verify issue is resolved in schema
user_schema, resp, err = await okta_client.get_user_schema('default')
    print(user_schema)

[justinabrokwah-okta]

Removing the call to re-format the response body in the next() method which returns the paginated response

Also done like this in resource clients:
https://github.com/okta/okta-sdk-python/blob/master/okta/resource_clients/user_client.py#L112-L114

[justinabrokwah-okta]

Not formatting the response body before creating the response in order to not change any custom attributes which may come through in here

[justinabrokwah-okta]

Applying logic to these models which have been reported to have issues with custom attributes

[arvindkrishnakumar-okta]

LGTM