Remove code which checks browser support for Intersection Observer and scrollTo options argument

Seems like a good refactor

@tom konda, thanks for catching this.

For commit, there should be confirmation here that these features are supported by the versions of browsers that Drupal supports. Can someone check this with the browser requirements → .

I checked both of Intersection Observer and scrollTo options argument in MDN and "Can I use".
I think all of browsers that require to support for Drupal, work well.
If we need to checking actual browser behavior, need to further working.

On the MDN, both of features display baseline badge as "Widely available".
Both of features had been supported at least since 2020 and compatibility table shows all of browsers are supported so all of supported browsers that Drupal have can work well.
On the "Can I use", all of the latest 2 major versions browsers that Drupal need to support, are shown as green both of Intersection Observer and scrollTo options argument.

Note:

1. The latest release of Firefox ESR on 2025-04-01 works as well as Firefox 128. (Firefox 128 was released in 2024)
2. Opera Mini (except for 'extreme data savings' mode) works as well as Opera Mobile. (See #3202818: Remove untrue declaration of Opera Mini (in reverse proxy mode) support from Drupal 9.3 → )

#8 looks comprehensive.

Committed 9bde009 and pushed to 11.x. Thanks!

nod_ → closed merge request !10654

Automatically closed - issue fixed for 2 weeks with no activity.