Invalid column name found in table constraint for DB2 ingestion

[Prajwal214]

Affected module
Does it impact the UI, backend or Ingestion Framework? -- Ingestion

Describe the bug
A clear and concise description of what the bug is.
-- When using the inspector.get_unique_constraints() function to retrieve unique constraints for a DB2 table, the function returns columns that do not exist in the table. Specifically, the function returns a prjid column that is not listed in the actual table columns returned by inspector.get_columns().

To Reproduce

Screenshots or steps to reproduce

1. Use the inspector.get_unique_constraints() method to retrieve unique constraints for a DB2 table.
2. Compare the columns listed in the unique constraints against the actual columns retrieved by inspector.get_columns().
3. Observe that the inspector.get_unique_constraints() returns columns like prjid that do not exist in the table.

Expected behavior
A clear and concise description of what you expected to happen.

Version:

• OS: [e.g. iOS]
• Python version:
• OpenMetadata version: [e.g. 0.8] OM v1.5.5
• OpenMetadata Ingestion package version: [e.g. openmetadata-ingestion[docker]==XYZ] v.1.5.5

Additional context
Add any other context about the problem here.