Update attribute-behavior fixture (#22522)

* Fix missing key warning

* Add build instructions

* Update interpretation now that React 17 is latest stable and 18 is next

* Ignore ReactDOM.render deprecation warning

* Ensure a server implementation with `renderToString` is used

* Update AttributeTableSnapshot

* Ensure Popover doesn't overflow

Author: eps1lon

fixtures/attribute-behavior/.gitignore

@@ -10,7 +10,7 @@
 /build
 /public/react.development.js
 /public/react-dom.development.js
-/public/react-dom-server.browser.development.js
+/public/react-dom-server-legacy.browser.development.js
 
 # misc
 .DS_Store