bugfix to event freshness test

Author: haritamar

macros/edr/data_monitoring/monitors_query/table_monitoring_query.sql

@@ -77,13 +77,12 @@
 
 {% macro get_timestamp_table_query(monitored_table, metric_properties, timestamp_column, table_metrics, min_bucket_start, max_bucket_end, full_table_name_str) %}
     {%- set timestamp_col_expr = elementary.edr_cast_as_timestamp(elementary.escape_reserved_keywords(timestamp_column)) -%}
-    {%- set event_timestamp_col_expr = elementary.edr_cast_as_timestamp(elementary.escape_reserved_keywords(event_timestamp_column)) -%}
 
     with partially_time_filtered_monitored_table as (
         select
             {{ timestamp_col_expr }} as monitored_table_timestamp_column
             {%- if metric_properties.timestamp_column and metric_properties.event_timestamp_column %}
-            , {{ event_timestamp_col_expr }} as monitored_table_event_timestamp_column
+            , {{ elementary.edr_cast_as_timestamp(elementary.escape_reserved_keywords(metric_properties.event_timestamp_column)) }} as monitored_table_event_timestamp_column
             {%- endif %}
         from {{ monitored_table }}
         -- Freshness metric calculated differences between consecutive buckets, thus the first diff