1.1.1 CI tweak: delete metal3 deployments after pivot (backport)

Francois Eleouetrequested to merge
bp-metal3-bootstrap-delete into 1.1.1-ci-tweaks

What does this MR do and why?

delete metal3 deployments after pivot as they sometimes still try to control, the baremetal hosts event if the custom resources are gone

backport of !2948 (merged) in a new 1.1.1-ci-tweaks branch, branched from 1.1.1

related to #1661 (closed)

Edited by Thomas Morin

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