### What problem does this PR solve? - Implement new SDK API test cases for chat assistant CRUD operations - Enhance HTTP API concurrent tests to use as_completed for better reliability ### Type of change - [x] Add test cases - [x] Refactoring
### What problem does this PR solve? fix document typo in test ### Type of change - [x] Typo
### What problem does this PR solve? Move test cases only - CI still runs tests under sdk/python ### Type of change - [x] Refactoring