Provision not working with 2.490

[mawinter69]

Jenkins and plugins versions report

version 2.66 of the plugin
Jenkins 2.490

What Operating System are you using (both controller, and any agents involved in the problem)?

doesn't matter

Reproduction steps

define a cloud and go to the /computer page. The button to provision is not working.
The reason is the usage of YAHOO in

openstack-cloud-plugin/plugin/src/main/resources/jenkins/plugins/openstack/compute/JCloudsCloud/computerSet.jelly

Line 45 in 247cdad

var menu = new YAHOO.widget.Button(e, { type: "menu", menu: items, name: "name" });

Since 2.490 YUI is no longer loaded by default in Jenkins which leads to a Javascript error

Expected Results

Clicking the button allows to provision a node

Actual Results

JS error

Anything else?

Take this opportunity to also remove the inline Javascript and move it to a separate file to make that part CSP compliant.
The solution done in the EC2 plugin can serve as a blueprint: jenkinsci/ec2-plugin#997

Are you interested in contributing a fix?

No response

[mawinter69]

Copy of https://issues.jenkins.io/browse/JENKINS-73545