fix(lazy): adjust the type of defineCustomElements (#4592)

This fixes an issue with the type for `defineCustomElements` that we set
in output-lazy-loader.ts. In #4419 we changed the return type of the
function to be `void` (at runtime) but we didn't make a corresponding
adjustment to the type declaration for the function that we generate
here:

https://github.com/ionic-team/stencil/blob/7d5dc6cf5e0d2020c513cc87b6b2e5b93eece9bc/src/compiler/output-targets/output-lazy-loader.ts#L88

This change adjusts that type declaration to have a `void` return value,
instead of `Promise<void>`.

See #4589 for more context

src/compiler/output-targets/dist-lazy/lazy-output.ts

@@ -187,7 +187,7 @@ const getLazyEntry = (isBrowser: boolean): string => {
   } else {
     s.append(`import { globalScripts } from '${STENCIL_APP_GLOBALS_ID}';\n`);
     s.append(`export const defineCustomElements = (win, options) => {\n`);
-    s.append(`  if (typeof window === 'undefined') return Promise.resolve();\n`);
+    s.append(`  if (typeof window === 'undefined') return undefined;\n`);
     s.append(`  globalScripts();\n`);
     s.append(`  return bootstrapLazy([/*!__STENCIL_LAZY_DATA__*/], options);\n`);
     s.append(`};\n`);

src/compiler/output-targets/output-lazy-loader.ts

@@ -85,7 +85,7 @@ export interface CustomElementsDefineOptions {
   ael?: (el: EventTarget, eventName: string, listener: EventListenerOrEventListenerObject, options: boolean | AddEventListenerOptions) => void;
   rel?: (el: EventTarget, eventName: string, listener: EventListenerOrEventListenerObject, options: boolean | AddEventListenerOptions) => void;
 }
-export declare function defineCustomElements(win?: Window, opts?: CustomElementsDefineOptions): Promise<void>;
+export declare function defineCustomElements(win?: Window, opts?: CustomElementsDefineOptions): void;
 export declare function applyPolyfills(): Promise<void>;
 
 /**