Image versions for ml-pipeline-* pods remain in the older version after the upgrade to 1.8

[eleblebici]

Bug Description

According to the version matrix here KFP backend version for Kubeflow 1.8 is 2.0.3. After the upgrade to CK 1.8, for the existing users/namespaces, ml-pipeline-* pods are still running with the older version which is 2.0.0-alpha.7 for CK 1.7.

To Reproduce

1. deploy CK 1.7
2. Create a user namespace
3. Upgrade CK to 1.8

Environment

Charmed Kubeflow 1.7 and 1.8
Tested with microk8s 1.30

Relevant Log Output

microk8s kubectl describe pod ml-pipeline-visualizationserver-955b54775-fgr8f -n admin

...
Containers:
 ml-pipeline-visualizationserver:
  Container ID:  containerd://f6d0ce02ee312bbb6741e4cf1949e08a7dc2aabb87de54c24bcfd5ae36374325
  Image:     gcr.io/ml-pipeline/visualization-server:2.0.3
  Image ID:    gcr.io/ml-pipeline/visualization-server@sha256:33028a61d49d37fb22a43362cd376c45062084e453094d784017cd9186057699
...

Additional Context

No response

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-6427.

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