Improve error handling with DataIntegrityException

Introduce a new `DataIntegrityException` class to handle data
integrity issues. Replace the logging and early return for
`null` `RestType` in `InvokeRecActionCommandHandler` with
throwing the new exception. This ensures explicit error
handling and improves runtime issue detection.

src/ReC.Application/Common/Exceptions/DataIntegrityException.cs

@@ -0,0 +1,8 @@
+namespace ReC.Application.Common.Exceptions;
+
+public class DataIntegrityException : Exception
+{
+    public DataIntegrityException() { }
+
+    public DataIntegrityException(string message) : base(message) { }
+}