CCM-9142: Fix preview letters UI component test

Author: m-salaudeen

tests/test-team/template-mgmt-e2e-tests/template-mgmt-letter-file-validation.e2e.spec.ts

@@ -84,7 +84,7 @@ test.describe('letter file validation', () => {
       expect(csv?.ChecksumSHA256).toEqual(
         pdfUploadFixtures.withPersonalisation.csv.checksumSha256()
       );
-    }).toPass({ timeout: 10_000 });
+    }).toPass({ timeout: 100_000 });
   });
 
   test('Uploaded pdf template files and test data csv files are virus scanned - if scan fails, files are deleted from quarantine and not copied, file and template status updated in database', async ({