TEST: Added test cases for Delete Dataset HTTP API (#5770)

### What problem does this PR solve?

1. cover dataset deletion endpoints
2. format code with ruff

### Type of change

- [x] add testcases
- [ ] style

sdk/python/pyproject.toml

@@ -22,4 +22,5 @@ test = [
 [tool.pytest.ini_options]
 markers = [
     "slow: marks tests as slow (deselect with '-m \"not slow\"')",
+    "wip: marks tests as work in progress (deselect with '-m \"not wip\"')"
 ]