Revert "Merge branch 'fixes/fix-sidekiq-deployment-labels' into 'master'"

This reverts merge request !442 (merged)

The merge request introduced a breaking change because of the immutability of kubernetes label matcher.

Error: UPGRADE FAILED: Deployment.apps "production-sidekiq-all-in-1" is invalid: spec.selector: Invalid value: v1.LabelSelector{MatchLabels:map[string]string{"app":"sidekiq", "release":"production", "queue-pod-name":"all-in-1"}, MatchExpressions:[]v1.LabelSelectorRequirement(nil)}: field is immutable