refactor: priority messages duplication

frontend/types/case.ts

@@ -101,11 +101,6 @@ type CaseMessages = {
   pleaseEnterTitle: string;
   description: string;
   testCaseDescription: string;
-  priority: string;
-  critical: string;
-  high: string;
-  medium: string;
-  low: string;
   type: string;
   other: string;
   security: string;

frontend/types/priority.ts

@@ -0,0 +1,7 @@
+type PriorityMessages = {
+  critical: string;
+  high: string;
+  medium: string;
+  low: string;
+};
+export type { PriorityMessages };