[PM-23580] Security Task Metrics (#6164)

* add metrics endpoint for an organization to return completed and total security tasks

* refactor metrics fetch to use sql sproc for efficiency rather than having to pull all security task data

* add separate response model for security task metrics endpoint

* Pascal Case to match existing implementations

* refactor org to organization for consistency with other methods

* alter security task endpoint:
- remove "count" from variable naming
- update sproc naming

* remove enablement check

* replace orgId with organizationId

util/Migrator/DbScripts/2025-08-12_00_SecurityTaskMetrics.sql

@@ -0,0 +1,15 @@
+CREATE OR ALTER PROCEDURE [dbo].[SecurityTask_ReadMetricsByOrganizationId]
+    @OrganizationId UNIQUEIDENTIFIER
+AS
+BEGIN
+    SET NOCOUNT ON
+
+    SELECT
+        COUNT(CASE WHEN st.[Status] = 1 THEN 1 END) AS CompletedTasks,
+        COUNT(*) AS TotalTasks
+    FROM
+        [dbo].[SecurityTaskView] st
+    WHERE
+        st.[OrganizationId] = @OrganizationId
+END
+GO