fix(OnyxTextarea): Fix first manual resizing being canceled on Firefox

[JoCa96]

Relates to #1142

The issue seems to be specific to Firefox: Changing CSS properties that effect if onyx-textarea__wrapper::after is rendered abort the user's resizing action. As a workaround, we instead set the height to 0px, which also disables the auto-sizing of the textarea.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 3d79ffcf6b1a6a509dee9b8ebf0834046808d71c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 7 packages

| Name | Type | | ------------------------- | ----- | | sit-onyx | Patch | | alpha-test-app | Patch | | playground | Patch | | @sit-onyx/chartjs-plugin | Patch | | @sit-onyx/nuxt | Patch | | @sit-onyx/storybook-utils | Patch | | @sit-onyx/vitepress-theme | Patch |

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