feat(repeat): now has configurable delay (#6640)

* feat(repeat): now has configurable delay

Adds a feature to `repeat` to match the configurable API of `retry`.
`repeat` can now be used in a similar manner to `repeatWhen`, only
perhaps in a more developer-friendly way.

- Also updates `repeat` tests to use run mode.

* chore: remove unnecessary unsub in test

Author: benlesh

api_guard/dist/types/index.d.ts

@@ -559,7 +559,7 @@ export declare function reduce<V, A, S = A>(accumulator: (acc: A | S, value: V,
 
 export declare function refCount<T>(): MonoTypeOperatorFunction<T>;
 
-export declare function repeat<T>(count?: number): MonoTypeOperatorFunction<T>;
+export declare function repeat<T>(countOrConfig?: number | RepeatConfig): MonoTypeOperatorFunction<T>;
 
 export declare function repeatWhen<T>(notifier: (notifications: Observable<void>) => Observable<any>): MonoTypeOperatorFunction<T>;
 

api_guard/dist/types/operators/index.d.ts

@@ -229,7 +229,7 @@ export declare function reduce<V, A, S = A>(accumulator: (acc: A | S, value: V,
 
 export declare function refCount<T>(): MonoTypeOperatorFunction<T>;
 
-export declare function repeat<T>(count?: number): MonoTypeOperatorFunction<T>;
+export declare function repeat<T>(countOrConfig?: number | RepeatConfig): MonoTypeOperatorFunction<T>;
 
 export declare function repeatWhen<T>(notifier: (notifications: Observable<void>) => Observable<any>): MonoTypeOperatorFunction<T>;