[@types/jest] Update jest.fail return type from void to never. (#31745)

* Update `jest.fail` return type from `void` to `never`.

This should never return, right?

* Revert unrelated change

types/jest/index.d.ts

@@ -981,7 +981,7 @@ declare function pending(reason?: string): void;
 /**
  * Fails a test when called within one.
  */
-declare function fail(error?: any): void;
+declare function fail(error?: any): never;
 declare namespace jasmine {
     let DEFAULT_TIMEOUT_INTERVAL: number;
     function clock(): Clock;