spectrum-Search-icon should be pushed down into TextFieldBase (#1685)
* Fix to use spectrum-Textfield-icon instaed of spectrum-Search-icon
* Delete UNSAFE_className
* small adjustment to left position of the icon which drifted too far to the start edge
* Update to match padding from spectrum-css
We need to check in with design on this before we can merge it
* fix start padding to rely on textfield
Co-authored-by: Rob Snow <rsnow@adobe.com>