Description of problem: EUS Upgrade ACM from 2.13 to 2.15, HCM reports error due to site config failed to udpate resource.

cluster access informaiton is here - https://docs.google.com/spreadsheets/d/1yg75xNpeO1i_K39D43FZmMauQe2d2OuJ1UjunX7jz3A/edit?pli=1&skip_itp2_check=true&gid=0#gid=0&range=B31

```

  conditions:
  - lastTransitionTime: "2025-11-17T00:32:14Z"
    lastUpdateTime: "2025-11-17T00:32:14Z"
    message: All hub components ready.
    reason: ComponentsAvailable
    status: "True"
    type: Complete
  - lastTransitionTime: "2025-11-10T12:22:36Z"
    lastUpdateTime: "2025-11-17T00:52:43Z"
    message: 'Updating Deployment/siteconfig-controller-manager to target version:
      2.15.0.'
    reason: UpdatingComponentResource
    status: "True"
    type: Progressing
  - lastTransitionTime: "2025-11-17T00:52:43Z"
    lastUpdateTime: "2025-11-17T00:52:43Z"
    message: 'failed to update resource Kind: Deployment Name: siteconfig-controller-manager:
      Deployment.apps "siteconfig-controller-manager" is invalid: spec.template.spec.containers[1].image:
      Required value'
    reason: FailedApplyingComponent
    status: "True"
    type: 'ComponentFailure: siteconfig-controller-manager (Kind:Deployment)'
  currentVersion: 2.15.0
  desiredVersion: 2.15.0
  mceVersionCompliance:
    currentVersion: 2.10.0
    isCompliant: true
    message: MCE version 2.10.0 meets channel stable-2.10 requirements
    requiredChannel: stable-2.10
  phase: Error

```

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

MCE - 2.10.0-DOWNSTREAM-2025-11-16-00-19-33

ACM - 2.15.0-DOWNSTREAM-2025-11-16-00-20-10

How reproducible:

Steps to Reproduce:

1. Deploy ACM 2.13.z
2. run the EUS upgrade ACM from 2.13.z to 2.15
3. HCM status is error due to site config failed to udpate resource.

Actual results:

Expected results:

Additional info: