Enable parallel drain by default. #5976
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: mwielgus, x13n The full list of commands accepted by this bot can be found here. The pull request process is described here
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What type of PR is this?
/kind cleanup
/kind feature
/kind deprecation
What this PR does / why we need it:
Parallel drain is already working in GKE for a while and can safely be used as a default mode of operation. Additionally, there are currently two implementations of scale down logic, which affects maintainability. This is a step towards removing the legacy logic.
Which issue(s) this PR fixes:
Fixes #5079
Special notes for your reviewer:
Does this PR introduce a user-facing change?
Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.: