fix(datetime): use scroll listener to detect month changes (#25586)

resolves #25257, resolves #25608, resolves #24980

Author: liamdebeasi

core/src/components/datetime/datetime.scss

@@ -103,9 +103,8 @@
 }
 
 /**
- * Safari 14 has an issue where Intersection
- * Observer is incorrectly fired when
- * unhiding the calendar content.
+ * Safari 14 has an issue where a scroll event
+ * is incorrectly fired when unhiding the calendar content.
  * To workaround this, we set the opacity
  * of the content to 0 and hide it offscreen.
  *