Run jenkinsci/usage-in-plugins on JAXB usages

danielbeck suggested using https://github.com/jenkins-infra/deprecated-usage-in-plugins to analyze existing plugins from the Update Center.

It could provide a complementary interesting perspective on the JAXB usage amongst actual plugins hosted at the Jenkins Update center.

Acceptance Criteria

• list the main (all?) classes of JAXB
• run the modified version (See with Baptiste or Daniel for the existing patch) to get a report of the usages of these classes inside the hosted plugins
• Attach the report here, and write up a simple analysis of the content (i.e. is there a lot of usages, easy fix, proposals about what to test more given the outcome, etc.)