Python: Allow OpenAIAssistant model id to pass into setup resources

[moonbox3]

Motivation and Context

With the updated OpenAIAssistantAgent.setup_resources method, we weren't allowing one to pass in the ai_model_id as part of the method. This PR fixes that.

Description

PR fixes the setup_resources method to be able to override the chat_deployment_name as part of the OpenAISettings ai_model_id config.

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 😄

[markwallace-microsoft]

Python Test Coverage Report •

File	Stmts	Miss	Cover	Missing
semantic_kernel/agents/open_ai
open_ai_assistant_agent.py	185	6	97%	216, 229, 265, 435, 526, 614
TOTAL	19018	2380	87%

Python Unit Test Overview

Tests	Skipped	Failures	Errors	Time
3199	5 💤	0 ❌	0 🔥	1m 35s ⏱️