API, Task processing: fix ruff linting errors E721

Fixes errors from previous Github action:
```
Error: dp3/api/main.py:20:12: E721 Do not compare types, use `isinstance()`
Error: dp3/api/main.py:20:38: E721 Do not compare types, use `isinstance()`
Error: dp3/task_processing/task_hooks.py:96:20: E721 Do not compare types, use `isinstance()`
Error: dp3/task_processing/task_hooks.py:157:20: E721 Do not compare types, use `isinstance()`
```

dp3/api/main.py

@@ -17,10 +17,7 @@
 async def validation_exception_handler(request, exc):
     if request.url.path.replace(ROOT_PATH, "") == DATAPOINTS_INGESTION_URL_PATH:
         # Convert body to readable form
-        if type(exc.body) is dict or type(exc.body) is list:
-            body = json.dumps(exc.body)
-        else:
-            body = str(exc.body)
+        body = json.dumps(exc.body) if isinstance(exc.body, (dict, list)) else str(exc.body)
 
         DP_LOGGER.log_bad(body, str(exc), src=request.client.host)
 

dp3/task_processing/task_hooks.py

@@ -93,7 +93,7 @@ def run_on_creation(self, eid: str, task: DataPointTask):
                 hook_new_tasks = hook(eid, task)
 
                 # Append new tasks to process
-                if type(hook_new_tasks) is list:
+                if isinstance(hook_new_tasks, list):
                     new_tasks += hook_new_tasks
             except Exception as e:
                 self.elog.log("module_error")
@@ -154,7 +154,7 @@ def run_on_new(self, eid: str, dp: DataPointBase):
                 hook_new_tasks = hook(eid, dp)
 
                 # Append new tasks to process
-                if type(hook_new_tasks) is list:
+                if isinstance(hook_new_tasks, list):
                     new_tasks += hook_new_tasks
             except Exception as e:
                 self.elog.log("module_error")