[PM-26050] Migrate all DefaultUserCollection when claimed user is deleted (#6366)

* feat: migrate DefaultUserCollection to SharedCollection during user deletion

- Implemented migration of DefaultUserCollection to SharedCollection in EF UserRepository before deleting organization users.
- Updated stored procedures User_DeleteById and User_DeleteByIds to include migration logic.
- Added new migration script for updating stored procedures.

* Add unit test for user deletion and DefaultUserCollection migration

- Implemented a new test to verify the migration of DefaultUserCollection to SharedCollection during user deletion in UserRepository.
- The test ensures that the user is deleted and the associated collection is updated correctly.

* Refactor user deletion process in UserRepository

- Moved migrating DefaultUserCollection to SharedCollection to happen before the deletion of user-related entities.
- Updated the deletion logic to use ExecuteDeleteAsync for improved performance and clarity.
- Ensured that all related entities are removed in a single transaction to maintain data integrity.

* Add unit test for DeleteManyAsync in UserRepository

- Implemented a new test to verify the deletion of multiple users and the migration of their DefaultUserCollections to SharedCollections.
- Ensured that both users are deleted and their associated collections are updated correctly in a single transaction.

* Refactor UserRepositoryTests to use test user creation methods and streamline collection creation

* Ensure changes are saved after deleting users in bulk

* Refactor UserRepository to simplify migration queries and remove unnecessary loops for better performance

* Refactor UserRepository to encapsulate DefaultUserCollection migration logic in a separate method

* Refactor UserRepository to optimize deletion queries by using joins instead of subqueries for improved performance

* Refactor UserRepositoryTest DeleteManyAsync_Works to ensure GroupUser and CollectionUser deletion

---------

Co-authored-by: Thomas Rittson <31796059+eliykat@users.noreply.github.com>

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

@@ -52,6 +52,16 @@ BEGIN
     WHERE
         [UserId] = @Id
 
+    -- Migrate DefaultUserCollection to SharedCollection before deleting CollectionUser records
+    DECLARE @OrgUserIds [dbo].[GuidIdArray]
+    INSERT INTO @OrgUserIds (Id)
+    SELECT [Id] FROM [dbo].[OrganizationUser] WHERE [UserId] = @Id
+    
+    IF EXISTS (SELECT 1 FROM @OrgUserIds)
+    BEGIN
+        EXEC [dbo].[OrganizationUser_MigrateDefaultCollection] @OrgUserIds
+    END
+
     -- Delete collection users
     DELETE
         CU

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

@@ -66,6 +66,16 @@ BEGIN
     WHERE
         [UserId] IN (SELECT * FROM @ParsedIds)
 
+    -- Migrate DefaultUserCollection to SharedCollection before deleting CollectionUser records
+    DECLARE @OrgUserIds [dbo].[GuidIdArray]
+    INSERT INTO @OrgUserIds (Id)
+    SELECT [Id] FROM [dbo].[OrganizationUser] WHERE [UserId] IN (SELECT * FROM @ParsedIds)
+    
+    IF EXISTS (SELECT 1 FROM @OrgUserIds)
+    BEGIN
+        EXEC [dbo].[OrganizationUser_MigrateDefaultCollection] @OrgUserIds
+    END
+
     -- Delete collection users
     DELETE
         CU