Suppress SCP logs unless verbose explicitly enabled

[kirk-fitz]

Description

See JENKINS-62208.

Submitter checklist

• Link to JIRA ticket in description, if appropriate.
• Change is code complete and matches issue description.
• Appropriate unit or acceptance tests or explanation to why this change has no tests.
• Reviewer's manual test instructions provided in PR description. See Reviewer's first task below.

Reviewer checklist

• Run the changes and verified the change matches the issue description.
• Reviewed the code.
• Verified that the appropriate tests have been written or valid explanation given.
• If applicable, test installing this plugin on the Jenkins instance.

[kirk-fitz]

@nrayapati, @ghenkes, @wwftw

Hi,
Apologies for the very poor PR. This issue is really annoying me, and would like to see if it could be fixed.
I have only ever contributed to a full java plugin, and have not looked at a plugin that has groovy in it.
Also I am using vscode as my ide, and altough it seems to compile okay in mvn, vscode does not appear to see the groovy etc.
I created a simple jenkins pipeline to test this out, and it appears to be working, but I can not be sure, and I have not added any tests etc. I am happy to work on this, but would require guidance, or if a maintanier could look at the code, and enhance the fix.

Kirk