refactor(relay): extract shared relay policy presets across endpoints

pages/api/endpoint/getpreferredlanguage_api.js

@@ -22,6 +22,7 @@ import {
 } from "../../../actions/core/guards";
 import { respondError } from "../middleware/apiResponse";
 import { relayGet } from "../middleware/relayForwarding";
+import { RELAY_POLICY_LOOKUP } from "../middleware/relayPolicyPresets";
 
 export default async function ApiProxy(req, res) {
     const emailAddress = sanitizeString(req.query.emailAddress);
@@ -39,13 +40,7 @@ export default async function ApiProxy(req, res) {
         escapeODataString(emailAddress) +
         "'&$count=true&$select=pinswg_preferredlanguage,contactid";
 
-    const relayPolicy = {
-        method: "GET",
-        timeoutMs: 6000,
-        maxRetries: 1,
-        retryBaseDelayMs: 100,
-        retryMaxDelayMs: 500
-    };
+    const relayPolicy = RELAY_POLICY_LOOKUP;
 
     return relayGet({
         queryUrl,