fix: Validate UUID format in CreateOperationNodePayload

[sentry]

This PR addresses issue DALGO-BACKEND-26F by enforcing UUID format validation at the API schema level for operation node creation.

Previously, the input_node_uuid in CreateOperationNodePayload and input_model_uuid in ModelSrcOtherInputPayload were defined as plain str. This allowed non-UUID strings (e.g., numeric IDs like '1772272235615') to pass initial schema validation, only to cause a ValidationError when Django's UUIDField attempted to process them during ORM queries (e.g., CanvasNode.objects.get(uuid=...)).

Changes Made:

• Modified ddpui/schemas/dbt_workflow_schema.py:
  • Added import uuid.
  • Changed input_node_uuid in CreateOperationNodePayload from str to uuid.UUID.
  • Changed input_model_uuid in ModelSrcOtherInputPayload from str to uuid.UUID.

Impact:

• Pydantic (used by Ninja) will now automatically validate that input_node_uuid and input_model_uuid are valid UUID strings. Requests with invalid formats will receive a 422 Unprocessable Entity error with a clear validation message, preventing server-side exceptions.
• No changes were required in the ORM query calls (transform_api.py or dbtautomation_service.py) as Django's UUIDField natively accepts uuid.UUID objects directly, eliminating the need for explicit str() conversions.

Fixes DALGO-BACKEND-26F

[sentry]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.66%. Comparing base (75cb6fd) to head (4affa18).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1373   +/-   ##
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  Coverage   58.66%   58.66%           
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  Files         132      132           
  Lines       15690    15690           
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  Hits         9205     9205           
  Misses       6485     6485           

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