exposure_schema_validity test does not respect 'node' property

[data-blade]

Describe the bug
given exposure_a that...

• lists model_a and model_b in depends_on
• lists columns from both models in referenced_columns, using the node property for each

running exposure_schema_validity, set as test on model_a, will fail, since the referenced columns of model_b will be reported as missing

To Reproduce
create a simple setup with exposure_a, model_a and model_b as described above

Expected behavior
the test should not fail due to missing columns, since those are correctly linked to the respective node as described in the docs

Screenshots
n/a

Environment (please complete the following information):

• Elementary CLI (edr) version: 0.20.1
• Elementary dbt package version: 0.21.0
• dbt version you're using: 1.11.0-rc3
• Data warehouse: databricks -> dbt-databricks 1.11.3
• Infrastructure details: ?

Additional context
n/a

Would you be willing to contribute a fix for this issue?
if time allows

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