Enhance diagnostics on job import failure

[DKroot]

Description

I'm getting Job couldn't not be imported: check if it is already existing and verify all plugins used in this job are installed on the target jenkins instance.

There needs to be a way to get more details, otherwise this is very hard to troubleshoot. All the plugins used in the job seem to be in place. I went through the exercise of tweaking all the plugin versions in the imported config.xml to match the target server to no avail.

Related Issue

None

Changes proposed

Print additional (diagnostic) info on all failures.

Screenshots

Not needed