fix(TextArea): only add class name to outermost element (#5995)

Co-authored-by: Marie Lucca <[email protected]>

Author: joshblack

.changeset/three-boxes-help.md

@@ -0,0 +1,5 @@
+---
+"@primer/react": patch
+---
+
+fix(TextArea): only add class name to outermost element

packages/react/src/Textarea/Textarea.tsx

@@ -3,7 +3,6 @@ import React from 'react'
 import {TextInputBaseWrapper} from '../internal/components/TextInputWrapper'
 import type {FormValidationStatus} from '../utils/types/FormValidationStatus'
 import type {SxProp} from '../sx'
-import {clsx} from 'clsx'
 import classes from './TextArea.module.css'
 
 export const DEFAULT_TEXTAREA_ROWS = 7
@@ -78,7 +77,7 @@ const Textarea = React.forwardRef<HTMLTextAreaElement, TextareaProps>(
           disabled={disabled}
           rows={rows}
           cols={cols}
-          className={clsx(classes.TextArea, className)}
+          className={classes.TextArea}
           {...rest}
         />
       </TextInputBaseWrapper>