fix(platform): Capture Sentry Block Errors Correctly (#11404)

Currently we are capturing block errors via the scope only, this change
captures the error directly.

### Changes 🏗️

- capture the error as well as the scope in the executor manager
- Update the block error message to include additional details
- remove the __str__ function from blockerror as it is no longer needed

### Checklist 📋

#### For code changes:
- [x] I have clearly listed my changes in the PR description
- [x] I have made a test plan
- [x] I have tested my changes according to the test plan:
  <!-- Put your test plan here: -->
  - [x] Checked that errors are still captured in dev

Author: Swiftyos

autogpt_platform/backend/backend/executor/manager.py

@@ -252,9 +252,9 @@ async def execute_node(
             output_size += len(json.dumps(output_data))
             log_metadata.debug("Node produced output", **{output_name: output_data})
             yield output_name, output_data
-    except Exception:
+    except Exception as ex:
         # Capture exception WITH context still set before restoring scope
-        sentry_sdk.capture_exception(scope=scope)
+        sentry_sdk.capture_exception(error=ex, scope=scope)
         sentry_sdk.flush()  # Ensure it's sent before we restore scope
         # Re-raise to maintain normal error flow
         raise

autogpt_platform/backend/backend/util/exceptions.py

@@ -5,13 +5,9 @@ class BlockError(Exception):
     """An error occurred during the running of a block"""
 
     def __init__(self, message: str, block_name: str, block_id: str) -> None:
-        super().__init__(message)
-        self.message = message
-        self.block_name = block_name
-        self.block_id = block_id
-
-    def __str__(self):
-        return f"raised by {self.block_name} with message: {self.message}. block_id: {self.block_id}"
+        super().__init__(
+            f"raised by {block_name} with message: {message}. block_id: {block_id}"
+        )
 
 
 class BlockInputError(BlockError, ValueError):