test(item-sliding): re-enable flaky tests (#28192)

Issue number: internal

---------

<!-- Please do not submit updates to dependencies unless it fixes an
issue. -->

<!-- Please try to limit your pull request to one type (bugfix, feature,
etc). Submit multiple pull requests if needed. -->

## What is the current behavior?
<!-- Please describe the current behavior that you are modifying. -->

Some of the tests for `item-sliding` were being skipped due to
flakiness.

## What is the new behavior?
<!-- Please describe the behavior or changes that are being added by
this PR. -->

- Updated the tests to use the stable function, `dragElementBy` to
handle gestures, removing the gesture flakiness.
- Separated the basic test to lessen the gesture complexity else it
becomes flaky since it can't handle opening and closing and opening in
the same test.
- Tests are now checking all modes and all directions.
- Updated a utils function with a warning regarding an open issue with
RTL.


## Does this introduce a breaking change?

- [ ] Yes
- [x] No

<!-- If this introduces a breaking change, please describe the impact
and migration path for existing applications below. -->


## Other information

<!-- Any other information that is important to this PR such as
screenshots of how the component looks before and after the change. -->

N/A

---------

Co-authored-by: ionitron <hi@ionicframework.com>
Co-authored-by: Brandy Carney <brandyscarney@users.noreply.github.com>