fix(textarea): scrollbars are visible with overflow

[sean-perkins]

Pull request checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been reviewed and added / updated if needed (for bug fixes / features)
  • Some docs updates need to be made in the ionic-docs repo, in a separate PR. See the contributing guide for details.
• Build (npm run build) was run locally and any changes were pushed
• Lint (npm run lint) has passed locally and any fixes were made for failures

Pull request type

Please check the type of change your PR introduces:

• Bugfix
• Feature
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no api changes)
• Build related changes
• Documentation content changes
• Other (please describe):

What is the current behavior?

A textarea with overflow does not display scrollbars to the user. This makes it difficult for users to access overflowed content in a textarea that isn't using auto grow.

Issue URL: #26278

What is the new behavior?

• Overflow hidden only applies to auto grow textarea (where the contents will grow in height, resulting in no overflow)
• Scrollbars are visible for a textarea with overflow

Does this introduce a breaking change?

• Yes
• No

Other information

Capturing scrollbars in Playwright would be flaky, so test coverage is skipped for this PR.

Dev-build: 6.3.7-dev.11668447091.1afa4f71