[Bug] ParsedNode for seed node dup

### Is this a new bug in dbt-core?

- [X] I believe this is a new bug in dbt-core
- [X] I have searched the existing issues, and I could not find an existing issue for this bug

### Current Behavior

```python
@classmethod
def _deserialize(cls, dct: Dict[str, int]):
# The serialized ParsedNodes do not differ from each other
# in fields that would allow 'from_dict' to distinguis
# between them.
resource_type = dct["resource_type"]
if resource_type == "model":
return ModelNode.from_dict(dct)
elif resource_type == "analysis":
return AnalysisNode.from_dict(dct)
elif resource_type == "seed":
return SeedNode.from_dict(dct)
elif resource_type == "sql":
return SqlNode.from_dict(dct)
elif resource_type == "test":
if "test_metadata" in dct:
return GenericTestNode.from_dict(dct)
else:
return SingularTestNode.from_dict(dct)
elif resource_type == "operation":
return HookNode.from_dict(dct)
elif resource_type == "seed":
return SeedNode.from_dict(dct)
elif resource_type == "snapshot":
return SnapshotNode.from_dict(dct)
else:
return cls.from_dict(dct)
```

https://github.com/dbt-labs/dbt-core/blob/main/core/dbt/contracts/graph/nodes.py

### Expected Behavior

we need seed node only once

### Steps To Reproduce

https://github.com/dbt-labs/dbt-core/blob/main/core/dbt/contracts/graph/nodes.py

### Relevant log output

_No response_

### Environment

```markdown
- OS: Ubuntu20.04
- Python: 3.10
- dbt: 1.1.1
```

### Which database adapter are you using with dbt?

_No response_

### Additional Context

_No response_