DMP-5198 GenerateCaseDocumentForRetentionDateAutomatedTask - Rethrow Interrupted Exception

Wrote some tests

Author: karen-hedges

src/main/java/uk/gov/hmcts/darts/casedocument/service/GenerateCaseDocumentSingleCaseProcessor.java

@@ -4,4 +4,5 @@
 public interface GenerateCaseDocumentSingleCaseProcessor {
 
     void processGenerateCaseDocument(Integer caseId);
+    
 }