Google App Engine changes

[ludoch]

Adding the App Engine Wizard support has this warning now: only for GAE Java8

Well, while Java8 is massively used, we now also support Java11 and Java17 (need mostly appengine-web.xml runtime name to be changed to java11 or 17) so it would be nice to adapt the message.

Then the next step expose Cloud Endpoints Framework for GAE which is maybe obsolete? (unless it is a recent framework)

Overall, a new test validation with the 3 runtimes (8,11,17) would be nice to make sure our latest customers can still keep working with intellij and the new GAE bundled services based runtimes (8,11,17) all GA now.

[ivanporty]

Thanks @ludoch! @etanshaul fyi when you're back