Support image pull cache for App CR to archieve 'imagePullPolicy: IfNotPresent'

**Describe the problem/challenge you have**
Hello, is there an option similar to IfNotPresent in K8s for the image url used in fetch ?
https://carvel.dev/kapp-controller/docs/v0.48.x/packaging/
```
# App template used to create the underlying App CR.
# See 'App CR Spec' docs for more info
template:
spec:
fetch:
- imgpkgBundle:
image: registry.tkg.vmware.run/tkg-fluent-bit@sha256:...
```
The reason for this feature is:

- the image will be pulled so many times, e.g. 1403805 downloads shown in Harbor
- when image registry goes offline temporarily, kapp-controller reports error when reconciling App, but it’s not needed since the tag is immutable

This is discussed in https://kubernetes.slack.com/archives/CH8KCCKA5/p1700836690956389

**Describe the solution you'd like**

vendir v0.36.0 supports [Only run sync for stable versions, if vendir.yaml has changed since last sync · Issue #278 · carvel-dev/vendir](https://github.com/carvel-dev/vendir/issues/278). kapp-controller can utilize it.

**Anything else you would like to add:**
[Additional information that will assist in solving the issue.]

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