fix(textarea): legacy textarea respects padding (#27219)

Issue URL: resolves #27218

---------

<!-- Please refer to our contributing documentation for any questions on
submitting a pull request, or let us know here if you need any help:
https://ionicframework.com/docs/building/contributing -->

<!-- Some docs updates need to be made in the `ionic-docs` repo, in a
separate PR. See
https://github.com/ionic-team/ionic-framework/blob/main/.github/CONTRIBUTING.md#modifying-documentation
for details. -->

<!-- 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. -->

Padding is not applied to the `.native-textarea` element when using a
legacy textarea. It is applied in v6:
https://github.com/ionic-team/ionic-framework/blob/ae9689bf3e185749dd2e0b27864b1c99b129820e/core/src/components/textarea/textarea.scss#L98-L100

The modern textarea is not impacted.

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

- Padding is now added to `.native-textarea` with the legacy textarea.

## 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. -->

---------

Co-authored-by: ionitron <[email protected]>

Author: liamdebeasi

core/src/components/input/test/legacy/spec/input.e2e.ts-snapshots/input-spec-diff-ios-ltr-Mobile-Chrome-linux.png

@@ -160,6 +160,7 @@
 }
 
 // TODO: FW-2876 - Remove this selector
+:host(.legacy-textarea) .native-textarea,
 :host(.legacy-textarea) .textarea-legacy-wrapper::after {
   @include padding(var(--padding-top), var(--padding-end), var(--padding-bottom), var(--padding-start));
   @include border-radius(var(--border-radius));