Fix some warning in workflow.groovy

After jenkins update we start to get warning like
"Did you forget the `def` keyword?..field named status_style
(to a value of type String) which could
lead to memory leaks or other issues"
so add def for places we've missed it

Related: PRODX-52357
Change-Id: I4dddd30778d5cd910a9706419e30181c17d34514
2 files changed