Handle backslash path separators in Fabric file_path extraction

The Fabric-specific charindex/left/right logic only handled forward
slashes. Windows users running dbt against Fabric would get incorrect
directory_path and file_name values. Now dispatches on is_os_mac_or_linux
like the non-Fabric branches already do.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sdebruyn

macros/get_directory_pattern.sql

@@ -25,7 +25,12 @@
 {% macro get_dbtreplace_directory_pattern() %}
   {% if execute %}
     {%- if target.type == 'fabric' -%}
-      left(file_path, len(file_path) - charindex('/', reverse(file_path)))
+      {%- set on_mac_or_linux = dbt_project_evaluator.is_os_mac_or_linux() -%}
+      {%- if on_mac_or_linux -%}
+        left(file_path, len(file_path) - charindex('/', reverse(file_path)))
+      {%- else -%}
+        left(file_path, len(file_path) - charindex('\', reverse(file_path)))
+      {%- endif -%}
     {%- else -%}
       {%- set on_mac_or_linux = dbt_project_evaluator.is_os_mac_or_linux() -%}
       {%- if on_mac_or_linux -%}

models/marts/core/int_all_graph_resources.sql

@@ -51,7 +51,12 @@ unioned_with_calc as (
         end as prefix,
         {{ get_dbtreplace_directory_pattern() }} as directory_path,
         {% if target.type == 'fabric' %}
+        {%- set on_mac_or_linux = dbt_project_evaluator.is_os_mac_or_linux() -%}
+        {%- if on_mac_or_linux -%}
         right(file_path, charindex('/', reverse(file_path)) - 1) as file_name
+        {%- else -%}
+        right(file_path, charindex('\', reverse(file_path)) - 1) as file_name
+        {%- endif -%}
         {% else %}
         regexp_replace(file_path,'.*{{ get_regexp_directory_pattern() }}','') as file_name
         {% endif %}