[CL-834] Use intersection observer to determine if content scrolls (#16099)

* use intersection observer to fix dynamic content load issue

* set up mock intersection observer

* Create reusable hasScrollable content util

* return null from resize to fix type error

* remove Observer mock

* return observable

* refactor util and remove resize

* use async pipe for observable in template

* remove comment left in error

libs/components/src/utils/index.ts

@@ -1,3 +1,4 @@
 export * from "./aria-disable-element";
 export * from "./function-to-observable";
+export * from "./has-scrollable-content";
 export * from "./i18n-mock.service";