CCM-8692: remove uneeded unit test

Author: bhansell1

lambdas/backend-api/src/__tests__/templates/app/template-client.test.ts

@@ -813,35 +813,6 @@ describe('templateClient', () => {
       });
     });
 
-    test('should return a failure result when attempting to update a letter', async () => {
-      const { templateClient } = setup();
-
-      const data: UpdateTemplate = {
-        name: 'name',
-        templateStatus: 'NOT_YET_SUBMITTED',
-        templateType: 'LETTER',
-        language: 'it',
-        letterType: 'q1',
-      };
-
-      const result = await templateClient.updateTemplate(
-        templateId,
-        data,
-        owner
-      );
-
-      expect(result).toEqual({
-        error: expect.objectContaining({
-          code: 400,
-          message: 'Request failed validation',
-          details: {
-            templateType:
-              "Invalid discriminator value. Expected 'NHS_APP' | 'EMAIL' | 'SMS'",
-          },
-        }),
-      });
-    });
-
     test('should return a failure result, when saving to the database unexpectedly fails', async () => {
       const { templateClient, mocks } = setup();