allow user delete if they are not the only owner

src/Sql/dbo/Stored Procedures/OrganizationUser_ReadCountByOnlyOwner.sql

@@ -0,0 +1,25 @@
+CREATE PROCEDURE [dbo].[OrganizationUser_ReadCountByOnlyOwner]
+    @UserId UNIQUEIDENTIFIER
+AS
+BEGIN
+    SET NOCOUNT ON
+
+    ;WITH [OwnerCountCTE] AS
+    (
+        SELECT
+            OU.[UserId],
+            COUNT(1) OVER (PARTITION BY OU.[OrganizationId]) [ConfirmedOwnerCount]
+        FROM
+            [dbo].[OrganizationUser] OU
+        WHERE
+            OU.[Type] = 0 -- 0 = Owner
+            AND OU.[Status] = 2 -- 2 = Confirmed
+    )
+    SELECT
+        COUNT(1)
+    FROM
+        [OwnerCountCTE] OC
+    WHERE
+        OC.[UserId] = @UserId
+        AND OC.[ConfirmedOwnerCount] = 1
+END