[PM-16812] Shortcut duplicate group patch requests (#5354)

* Copy PatchGroupCommand to vNext and refactor

* Detect duplicate add requests and return early

* Update read repository method to use HA replica

* Add new write repository method

util/Migrator/DbScripts/2025-02-13_00_GroupUser_AddUsers.sql

@@ -0,0 +1,39 @@
+CREATE OR ALTER PROCEDURE [dbo].[GroupUser_AddUsers]
+    @GroupId UNIQUEIDENTIFIER,
+    @OrganizationUserIds AS [dbo].[GuidIdArray] READONLY
+AS
+BEGIN
+    SET NOCOUNT ON
+
+    DECLARE @OrgId UNIQUEIDENTIFIER = (
+        SELECT TOP 1
+            [OrganizationId]
+        FROM
+            [dbo].[Group]
+        WHERE
+            [Id] = @GroupId
+    )
+
+    -- Insert
+    INSERT INTO
+        [dbo].[GroupUser] (GroupId, OrganizationUserId)
+    SELECT DISTINCT
+        @GroupId,
+        [Source].[Id]
+    FROM
+        @OrganizationUserIds AS [Source]
+    INNER JOIN
+        [dbo].[OrganizationUser] OU ON [Source].[Id] = OU.[Id] AND OU.[OrganizationId] = @OrgId
+    WHERE
+        NOT EXISTS (
+            SELECT
+                1
+            FROM
+                [dbo].[GroupUser]
+            WHERE
+                [GroupId] = @GroupId
+                AND [OrganizationUserId] = [Source].[Id]
+        )
+
+    EXEC [dbo].[User_BumpAccountRevisionDateByOrganizationId] @OrgId
+END