RKE1 pod security admission support

[mantis-toboggan-md]

rancher/dashboard#7575

This PR adds PSA support during RKE1 configuration. This is only available for kubernetes versions >=1.23.0. Users creating clusters with versions <1.25 should have the same experience as before, with the addition of a banner informing them that psp support will be disabled in later versions.

Creating a >=1.25.0 cluster

• no psp options and a banner explaining why
• psa dropdown with a default of 'privileged'
• field being set is rancherKubernetesEngineConfig.services.kubeApi.podSecurityConfiguration

Upgrading to >=1.25.0 from a version with PSP support

• if psp support is enabled, there should be a banner warning to disable it and an error on attempting to create
• if there are psp resources within the cluster (one or more projects with a psp set) there should be a banner asking the user to delete these psp resources
• psa dropdown as with creating a >=1.23.0 cluster

rke1 templates

• users should be able to configure the psa config template field

testing

When I run the ember UI locally websockets do not work correctly: this makes testing cluster provisioning difficult (the ui waits for a message saying the cluster resource is created before creating node pools; this wont work without websockt support). I got around this by building the ember UI and running rancher-in-docker with that custom-built UI replacing the one bundled in the rancher/rancher image using the --mount command. If you don't want to go throught hat ping on slack and I'll give you login details for a testing setup.

[nwmac]

One change - we want to show the PSA Template drop down if the k8s version is >= 1.23

[nwmac]

@codyrancher Can you review my changes - I pushed a commit so that PSA support is enabled for >= 1.23 (which is when it is introduced). PSP removed in 1.25 and code updated as PSP support overlaps with PSA support now.