Test reliability fixes

Author: stevebux

tests/component-tests/apiGateway-tests/get-letter-pdf.spec.ts

@@ -54,7 +54,7 @@ test.describe("API Gateway Tests to Verify Get Letter PDF Endpoint", () => {
     const expiresSeconds = Number(expiresParam);
     expect(expiresSeconds).toBe(60);
 
-    const waitMs = Math.max(expiresSeconds * 1000 + 2000, 0);
+    const waitMs = Math.max(expiresSeconds * 1000 + 5000, 0);
     await new Promise((resolve) => {
       setTimeout(resolve, waitMs);
     });

tests/helpers/poll-for-letters-helper.ts

@@ -12,7 +12,7 @@ export async function pollForLetterStatus(
   const headers = createValidRequestHeaders(supplierId);
   let statusCode = 0;
   let letterStatus: string | undefined;
-  const RETRY_DELAY_MS = 10_000;
+  const RETRY_DELAY_MS = 15_000;
   const MAX_ATTEMPTS = 6;
 
   for (let attempt = 1; attempt <= MAX_ATTEMPTS; attempt++) {