feat: Enhance user group management and transaction handling in stored procedures

- Improved user group deletion logic to accurately report success or failure.
- Updated user group renaming checks to prevent unintended inserts or updates.
- Added documentation on transaction blocking risks during full resets in stored procedures.
- Removed unnecessary login scripts from database project.

Fuchs_Database/dbo/Stored Procedures/mfr__updt__companies.sql

@@ -20,6 +20,11 @@ BEGIN
 	DECLARE @tmp_cmd nvarchar(1000) = N'SELECT DISTINCT * FROM ' + @tblname
 	INSERT INTO @tmp EXECUTE [sp_executesql] @tmp_cmd;
 
+	-- Wrapping the DELETEs + MERGE below in one transaction gives all-or-nothing atomicity for
+	-- this entity's sync batch (same pattern in every mfr__updt__* proc). During a large full
+	-- reset this can hold locks on the affected tables for as long as the batch takes to run —
+	-- an accepted, documented risk, not an oversight. See
+	-- Docs/Decisions/0022-mfr-sync-transaction-blocking-accepted-risk.md before changing this.
 	BEGIN TRANSACTION;
 
 	IF @referencetable = 'mfr__companies'