fix: align IRepository events to RepositoryBase (#3036)

Options are now not required in `onXxx` methods, but IRepository
was not updated to that end.

Related #2921

packages/@aws-cdk/aws-ecr/lib/repository.ts

@@ -67,7 +67,7 @@ export interface IRepository extends IResource {
  * @param id The id of the rule
  * @param options Options for adding the rule
  */
- onCloudTrailEvent(id: string, options: events.OnEventOptions): events.Rule;
+ onCloudTrailEvent(id: string, options?: events.OnEventOptions): events.Rule;
 
  /**
  * Defines an AWS CloudWatch event rule that can trigger a target when an image is pushed to this
@@ -79,7 +79,7 @@ export interface IRepository extends IResource {
  * @param id The id of the rule
  * @param options Options for adding the rule
  */
- onCloudTrailImagePushed(id: string, options: OnCloudTrailImagePushedOptions): events.Rule;
+ onCloudTrailImagePushed(id: string, options?: OnCloudTrailImagePushedOptions): events.Rule;
 }
 
 /**