chore: merge provisioner key and provisioner permissions (#16628)

Provisioner key permissions were never any different than provisioners.
Merging them for a cleaner permission story until they are required (if
ever) to be seperate.

This removed `ResourceProvisionerKey` from RBAC and just uses the
existing `ResourceProvisioner`.

coderd/apidoc/docs.go

@@ -13730,7 +13730,6 @@ const docTemplate = `{
                 "organization_member",
                 "provisioner_daemon",
                 "provisioner_jobs",
-                "provisioner_keys",
                 "replicas",
                 "system",
                 "tailnet_coordinator",
@@ -13766,7 +13765,6 @@ const docTemplate = `{
                 "ResourceOrganizationMember",
                 "ResourceProvisionerDaemon",
                 "ResourceProvisionerJobs",
-                "ResourceProvisionerKeys",
                 "ResourceReplicas",
                 "ResourceSystem",
                 "ResourceTailnetCoordinator",