test(item): migrate inputs test to generators (#27416)

Issue number: N/A

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## What is the current behavior?
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I missed the `inputs` tests when migration `ion-item` to generators.

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

- The item input tests use the generator syntax.


https://github.com/ionic-team/ionic-framework/pull/27416/commits/a6f8563f3156d0e3d36327506cf722a4718a26e5

- I removed the RTL checks for the disabled state screenshots since that
behavior does not vary across directions.

## 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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