Create 3 variables for credentials in Jenkins

Purpose/Overview:

Create variables in Jenkins Job:

https://jenkins-aws.indexdata.com/job/FOLIO_Reference_Builds/job/folio-api-tests-karate/

Names:

 - kbEbscoCredentialsApiKey

 - kbEbscoCredentialsUrl

 - kbEbscoCredentialsCustomerId

Variables must be available when running Karate test for mod-kb-ebsco-java/features/kb-credentials.feature

Acceptance criteria:

Test are shown as passed in Cucumber report.