fix: added box-sizing to fix clipped textfield icon (#6712)

fix: added `box-sizing` to fix clipped textfield validation icon

Author: ssilare-adobe

packages/@adobe/spectrum-css-temp/components/textfield/index.css

@@ -227,6 +227,7 @@ governing permissions and limitations under the License.
   /* TODO: Confirm if this is ok for the validation icon sizing
     Note that the sizes are a bit different when compared with old background icons(more noticable for checkmark)
   */
+  box-sizing: content-box;
   position: absolute;
   padding-inline-end: calc(var(--spectrum-textfield-padding-x, var(--spectrum-global-dimension-size-150)) / 2);
   pointer-events: all;