Description of problem:

On the application of an invalid PinnedImageSet (PIS) resource, there is a typo in the `MachineConfigNodePinnedImageSetsDegraded` state's message field in the MachineConfigNode's (MCN) conditions list.

Version-Release number of selected component (if applicable):

This typo was introduced in 4.19, so it can be seen in both 4.19 & 4.20.

How reproducible:

Always when applying an invalid PIS.

Steps to Reproduce:

1. Launch a 4.20 or 4.19 cluster with tech preview enabled. Use the following launch command to create a cluster using ClusterBot.

launch 4.20 aws,techpreview 

2. Apply an invalid PIS, such as the below example.

apiVersion: machineconfiguration.openshift.io/v1
kind: PinnedImageSet
metadata:
  name: test-pinned
  labels:
    machineconfiguration.openshift.io/role: "worker"
spec:
  pinnedImages:
   - name: quay.io/rh-ee-ijanssen/machine-config-operator@sha256:65d3a308767b1773b6e3ead2ec1bcae499dde6ef085753d7e20e685f78841079
   - name: quay.io/rh-ee-ijanssen/machine-config-operator@sha256:fd3692eff21338e900a244dfe62152c959b84d73f2dd4503893de0f3fae61b0b 

3. Wait for the PIS to finish trying to apply, this should only take a few seconds.

4. Look at one of the MCN resources associated with a node targeted in the PIS.

a. Get the MCNs.

oc get machineconfignode

b. Copy the `NAME` value for one of the MCNs that has the value `worker` for `POOLNAME`. This is necessary since the applied PIS targets the `worker` role.

c. Observe the message for `MachineConfigNodePinnedImageSetsDegraded` in the MCN conditions list.

oc describe machineconfignode/<mcn-name-from-step-b>

Actual results:

The condition for `MachineConfigNodePinnedImageSetsDegraded` is:

    Last Transition Time:  2025-05-27T15:35:39Z
    Message:               One or more PinnedImageSet is experiencing an error. See PinnedImageSet list for more details
    Reason:                PrefetchFailed
    Status:                True
    Type:                  PinnedImageSetsDegraded

Expected results:

The message for `MachineConfigNodePinnedImageSetsDegraded` should not have a typo, so it should be:

One or more PinnedImageSet is experiencing an error. See PinnedImageSet list for more details.

Additional info:

• The message being referred to in this bug is set here: https://github.com/openshift/machine-config-operator/blob/5feede61e20a283bbfbbddab8f1e5c57e7b6efda/pkg/daemon/pinned_image_set.go#L649
• The change needed is adding a period at the end of the error string.
  • One or more PinnedImageSet is experiencing an error. See PinnedImageSet list for more details --> One or more PinnedImageSet is experiencing an error. See PinnedImageSet list for more details.