Rich text editor | Setting height in storybook docs

[vivinkrishna-ni]

Pull Request

🤨 Rationale

1. To provide more spacing and facilitate the exploration of various functionalities of the rich text editor, setting a default height in storybook docs until enabling the fit-to-content attribute.
2. To make the content, such as the links (Rich text editor & viewer | Support for absolute link #1496 (comment)), visible if any are added as part of the test, height is added for storybook tests.

👩‍💻 Implementation

1. Add height: 160px; to the rich text editor storybook doc.
2. Add height for the theme matrix test to isolate the Chromatic test difference from the Rich text editor & viewer | Support for absolute link #1496 PR.

🧪 Testing

Verified manually the differences in the height of the component in storybook docs and tests.

✅ Checklist

• I have updated the project documentation to reflect my changes or determined no changes are needed.

[jattasNI]

Thanks for splitting this out!