test(range): migrate to generators (#27369)

Issue number: N/A

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## What is the current behavior?
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Range tests are using legacy syntax

## What is the new behavior?
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this PR. -->

- Range tests are using generator syntax


https://github.com/ionic-team/ionic-framework/pull/27369/commits/849e12797426d293be0424bd9c8ed0df03817e1f

- The scroll target tests do not vary across modes so I removed those
additional checks.


https://github.com/ionic-team/ionic-framework/pull/27369/commits/0b8c15838a5f834a3b9ed3fb667b10ccd682eee9

- The standalone directory had some screenshots that were not in use, so
I deleted them


https://github.com/ionic-team/ionic-framework/pull/27369/commits/5b306f28b7add5645cbe0adef6ab6cde17dd98d8

- The modern range event tests do not vary across modes/directions, so I
removed the additional checks.


https://github.com/ionic-team/ionic-framework/pull/27369/commits/699fb62789dfbc0a6325ff18138ba554ae10d1d6

- The legacy scroll target tests do not vary across modes so I removed
those additional checks.


https://github.com/ionic-team/ionic-framework/pull/27369/commits/c7dbb2d38049d057072d0fadc6429cd949af7b07

- The legacy range functional tests do not vary across modes/directions,
so I removed the additional checks.


https://github.com/ionic-team/ionic-framework/pull/27369/commits/aa06ba8ebf7ab56c9f240252faf9a0485fe55b45

- The legacy range event tests do not vary across modes/directions, so I
removed the additional checks.

## Does this introduce a breaking change?

- [ ] Yes
- [x] No

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and migration path for existing applications below. -->


## Other information

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screenshots of how the component looks before and after the change. -->