End authentication attempt immediately if we couldn't find an appropriate flow (#2008)

If `doRequest()` in `interactive-auth.ts` fails to obtain an appropriate authentication flow, it should return immediately after rejecting the promise.  If it continues, it'll attempt to check `chosenFlow.stages`, which will cause an error because `chosenFlow` is `null`.  This was breaking the interactive auth spec tests with Node 16.

src/interactive-auth.ts

@@ -449,6 +449,7 @@ export class InteractiveAuth {
             } catch (e) {
                 this.attemptAuthDeferred.reject(e);
                 this.attemptAuthDeferred = null;
+                return;
             }
 
             if (