[SG-27732] wildcard: manual migration TextArea

Created by: gitstart-sourcegraph

Descriptions

• All incorrect usage of the previous pattern has been updated to use the Wildcard component
• Enable a rule to ban the textarea element. This should be similar to what has been done to the Button component.
• Migrate all usage of <textarea> in the codebase. Use the eslint output from step 1, or this Sourcegraph search.
• Move FlexTextArea to Wildcard.
• Replace TextAreaAutosize with FlexTextArea. We should be able to remove react-textarea-autosize as a dependency.

Refs

• SourceGraph Issue
• GitStart Ticket

PR on client side

• https://github.com/sourcegraph/sourcegraph/pull/28942