Merge pull request #8154 from raywainman/vpa-release-1.4

...od-autoscaler/deploy/admission-controller-deployment.yaml

...al-pod-autoscaler/deploy/recommender-deployment-high.yaml

...cal-pod-autoscaler/deploy/recommender-deployment-low.yaml

vertical-pod-autoscaler/deploy/recommender-deployment.yaml

vertical-pod-autoscaler/deploy/updater-deployment.yaml

vertical-pod-autoscaler/docs/flags.md

vertical-pod-autoscaler/docs/installation.md

vertical-pod-autoscaler/hack/generate-flags.sh

vertical-pod-autoscaler/hack/vpa-process-yaml.sh

vertical-pod-autoscaler/hack/vpa-up.sh