Test CKF 1.8 in airgapped environment

[ca-scribner]

Context

We need to test CKF 1.8 in an airgapped environment after:

• Release #453 to 2.0/stable kfp-operators#454
• Release track/2.0 to 2.0/stable after #91 envoy-operator#93

What needs to get done

.

Definition of Done

1. CKF 1.8 is shown to work in airgapped

[syncronize-issues-to-jira]

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-5643.

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[NohaIhab]

During test CKF in airgapped, it has been discovered that some charms' images were not in the local registry, and are not in the retagged-images.txt. Turns out the new charms in CKF 1.8 do not have the get-images.sh in their repos that is necessary for get-all-images.sh to add the images to the list and pull them. To fix that, I sent PRs for these charms to have the script:
canonical/mlmd-operator#83
canonical/pvcviewer-operator#37
canonical/envoy-operator#96

In addition, the mysql-k8s-operator charm was missing the github dependency repo and branch fields in our 1.8 bundle yaml, these are necessary for the get-all-images.sh script to get the mysql image. Sent a fix in #902.

[NohaIhab]

To run the tests, we are using the script in bundle-kubeflow repo to setup the airgapped env. The script did not work out of the box with uk8s 1.25 and juju 3.1, in addition to a bug in py-docker. To address these blockers, I sent #904. See all the details in the PR description.