Use src/default-custom-images.json in knative charms

[misohu]

Context

To specify rocks as default custom images for charms we use a pattern in other charms where we specify file src/default-custom-images.json with default image values. Kserve example. We want to apply same pattern for knative charms.

What needs to get done

1. Create src/default-custom-images.json
2. Use default image values from src/default-custom-images.json. Similar to this.
3. Implement all necessary charm logic.

Definition of Done

1. src/default-custom-images.json is created for all knative charms
2. custom-images logic is implemented in the hooks.

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The internal ticket has been created: https://warthogs.atlassian.net/browse/KF-6598.

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