Promote image CLI commands to stable

Remove experimental status from flux image commands in preparation
for GA release of image automation APIs.

Partial fix for #5411

Signed-off-by: Daniel Guns <danbguns@gmail.com>

cmd/flux/create_image_policy.go

@@ -35,12 +35,12 @@ import (
 var createImagePolicyCmd = &cobra.Command{
 	Use:   "policy [name]",
 	Short: "Create or update an ImagePolicy object",
-	Long: withPreviewNote(`The create image policy command generates an ImagePolicy resource.
+	Long: `The create image policy command generates an ImagePolicy resource.
 An ImagePolicy object calculates a "latest image" given an image
 repository and a policy, e.g., semver.
 
 The image that sorts highest according to the policy is recorded in
-the status of the object.`),
+the status of the object.`,
 	Example: `  # Create an ImagePolicy to select the latest stable release
   flux create image policy podinfo \
     --image-ref=podinfo \