JENKINS-64196 Move PluginManager available page to client side (#5051)

* Move PluginManager available to client side

* Fix in IE

* Address feedback from ux-sig demo

* Add handlebars module

* Handlebars plugin manager

* Update core/src/main/java/hudson/model/UpdateCenter.java

* Remove import

* Fix input

* Remove debug

* Use rest client

* Fix bug

* Move properties to right location

* Cleanup

* Use lodash debounce

* Revert properties change

* Fmt

* Rank exact matches at the top

* Set locale

* Spotbugs

* ignore case in nicer way

* Sorting improvements