Allow selecting User Scope defined credentials for authentification
User Scoped credentials don't appear in credentials drop down lists
Upgrade to Credentials 2.1.0+ API for populating credentials drop-down
Allow credential parameters to shadow credential ids in lookup
CloudBees Internal OSS-2573
This should be addressed via JENKINS-58170.
You can now specify a credentials parameter to a build which can be used as the credentials id for using user-scoped credentials. See JENKINS-58170.