Change init to sync function

Author: Mrtenz

packages/snaps-controllers/src/snaps/SnapController.test.tsx

@@ -9932,7 +9932,7 @@ describe('SnapController', () => {
         );
 
         const call = jest.spyOn(messenger, 'call');
-        await messenger.call('SnapController:init');
+        messenger.call('SnapController:init');
         await sleep(10);
 
         expect(call).toHaveBeenNthCalledWith(
@@ -9999,7 +9999,7 @@ describe('SnapController', () => {
           }),
         );
 
-        await messenger.call('SnapController:init');
+        messenger.call('SnapController:init');
         await sleep(10);
 
         expect(consoleErrorSpy).toHaveBeenCalledWith(

packages/snaps-controllers/src/snaps/SnapController.ts

@@ -1172,7 +1172,7 @@ export class SnapController extends BaseController<
   #registerMessageHandlers(): void {
     this.messagingSystem.registerActionHandler(
       `${controllerName}:init`,
-      async (...args) => this.init(...args),
+      (...args) => this.init(...args),
     );
 
     this.messagingSystem.registerActionHandler(
@@ -1287,7 +1287,7 @@ export class SnapController extends BaseController<
    * Currently this method calls the `onStart` lifecycle hook for all
    * installed Snaps.
    */
-  async init() {
+  init() {
     const snaps = this.getAllSnaps();
     for (const { id } of snaps) {
       const hasLifecycleHooksEndowment = this.messagingSystem.call(