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/FuchsDatabase.sqlproj

@@ -146,8 +146,6 @@
     <Build Include="Security\fds_rwe.sql" />
     <Build Include="Security\fuchs_web.sql" />
     <Build Include="Security\fuchs_fds.sql" />
-    <Build Include="Security\fuchs_web.login.sql" />
-    <Build Include="Security\fuchs_fds.login.sql" />
     <Build Include="dbo\Functions\vat_val.sql" />
     <Build Include="dbo\Functions\strings_replaceSpecialCharsInHTML.sql" />
     <Build Include="dbo\Functions\strings_removeLeading0_255.sql" />