fix: not_null_proportion test deprecation warning and performance (#416)

* fix to make not-null-proportion work as intended and remove decpration warning;

* fix for object type in excluded columns

* clean up namespace formatting

* fix to make not-null-proportion work as intended and remove decpration warning;

* remove  utils.star from separate change

* remove utils.star from unrelated change

Co-authored-by: Jason Ganx <jasonganx@jason-ganx.myfiosgateway.com>

Author: jasnonaz

macros/schema_tests/not_null_proportion.sql

@@ -1,5 +1,5 @@
 {% macro test_not_null_proportion(model) %}
-  {{ return(adapter.dispatch('test_not_null_proportion', packages = dbt_utils._get_utils_namespaces())(model, **kwargs)) }}
+  {{ return(adapter.dispatch('test_not_null_proportion', 'dbt_utils')(model, **kwargs)) }}
 {% endmacro %}
 
 {% macro default__test_not_null_proportion(model) %}
@@ -9,7 +9,7 @@
 {% set at_most = kwargs.get('at_most', kwargs.get('arg', 1)) %}
 
 with validation as (
-  select 
+  select
     sum(case when {{ column_name }} is null then 0 else 1 end) / cast(count(*) as numeric) as not_null_proportion
   from {{ model }}
 ),
@@ -19,8 +19,8 @@ validation_errors as (
   from validation
   where not_null_proportion < {{ at_least }} or not_null_proportion > {{ at_most }}
 )
-select 
-  count(*)
+select
+  *
 from validation_errors
 
 {% endmacro %}