Remove Promise allSettled polyfill as its widespread enough now and js-sdk uses it directly

src/utils/promise.ts

@@ -51,24 +51,6 @@ export function defer<T>(): IDeferred<T> {
     return {resolve, reject, promise};
 }
 
-// Promise.allSettled polyfill until browser support is stable in Firefox
-export function allSettled<T>(promises: Promise<T>[]): Promise<Array<ISettledFulfilled<T> | ISettledRejected>> {
-    if (Promise.allSettled) {
-        return Promise.allSettled<T>(promises);
-    }
-
-    // @ts-ignore - typescript isn't smart enough to see the disjoint here
-    return Promise.all(promises.map((promise) => {
-        return promise.then(value => ({
-            status: "fulfilled",
-            value,
-        })).catch(reason => ({
-            status: "rejected",
-            reason,
-        }));
-    }));
-}
-
 // Helper method to retry a Promise a given number of times or until a predicate fails
 export async function retry<T, E extends Error>(fn: () => Promise<T>, num: number, predicate?: (e: E) => boolean) {
     let lastErr: E;