Fix error handling in kctrl package release command

[goshkis]

What steps did you take:

❯ kctrl package release --chdir "carvel-packages/my-package-name" --version "0.0.1" --yes --repo-output ../../package-repository

[...skipped...]
Building images and resolving references
	    | $ ytt -f /var/folders/t2/ypy2b3v55g163rqdg934k2pr0000gp/T/kapp-controller-fetch-template-[...skipped...]
An imgpkg bundle consists of all required manifests bundled into an OCI image.
This image is pushed to a registry and consumed by the package.
Pushing imgpkg bundle
	    | $ imgpkg push -b [...skipped...]:build-1714175591 -f ./bundle-[...skipped...]:build-1714175591-2627758157 --tty=true
	    | dir: .
	    | dir: .imgpkg
	    | file: .imgpkg/images.yml
[...skipped...]
	    | Pushed '[...skipped...]@sha256:4525b5ee06.......41dcf7801'
	    | Succeeded

Succeeded

❯ ls package-repository/
pkgrepo-build.yml

^^^ No package content

What happened:
kctrl package release ... --repo-output ... command is silently ignoring errors from releaseResources function.
Say, if incompatible ytt version is installed, this command will not yield any errors but no content will be written to the destination.

What did you expect:
Expected error in this specific environment:

	    | Succeeded

kctrl: Error: exit status 1: ytt:
  Error: unknown flag: --data-values-schema-inspect

Anything else you would like to add:
n/a

Environment:
n/a

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