[Misc] Remove concurrency since the concurrency param on the stage step is now deprecated and the new solution involves using two plugins: Lockable Resources Plugin and Pipeline Milestone Step Plugin plugin and it's quite complex (and I don't think we want to use the milestone() step to remove older builds as described on https://www.quernus.co.uk/2016/10/19/lockable-resources-jenkins-pipeline-builds/).
[Misc] Remove concurrency since the concurrency param on the stage step is now deprecated and the new solution involves using two plugins: Lockable Resources Plugin and Pipeline Milestone Step Plugin plugin and it's quite complex (and I don't think we want to use the milestone() step to remove older builds as described on https://www.quernus.co.uk/2016/10/19/lockable-resources-jenkins-pipeline-builds/).

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