[NEXUS-6849] Move NuGet ui code to coreui plugin

Signed-off-by: Alin Dreghiciu <adreghiciu@gmail.com>
Merge pull request #724 from sonatype/NEXUS-6849-move-nuget-ui-to-oss

[NEXUS-6849] Move NuGet ui code to coreui plugin
Merge remote-tracking branch 'origin/master' into NX-698-react-on-controller-changes

Conflicts:
	plugins/rapture/nexus-coreui-plugin/src/main/resources/static/rapture/NX/coreui/app/PluginConfig.js