fix: support dbt Core 1.10+ arguments: keyword in unique_combination_of_columns

[Hitendrasinhdata7]

Fixes #1058

Problem

Users on dbt Core 1.10+ get this compilation error when using
the arguments: keyword wrapper with unique_combination_of_columns:

macro 'dbt_macro__test_unique_combination_of_columns'
takes no keyword argument 'arguments'

Root Cause

dbt Core 1.10+ passes test arguments as kwargs when using the
arguments: keyword wrapper. The macro was not reading from kwargs.

Fix

Added kwargs.get() calls so both syntaxes work correctly.

Testing

Added integration test covering new arguments: syntax.
Both old and new syntax pass:

Old syntax (dbt < 1.10)
New syntax (dbt >= 1.10)

[joellabes]

Which patch version of dbt 1.10 are you using? Please make sure you have the latest patch installed (v1.10.20) as I believe this is unnecessary.