Replace non-existing manifests and prevent them from changing in the future

[tkrishtop]

Description of the change:

This PR is to be merged after the PR @acornett21 : #6422

• Fix: Replace non-existing manifests for scorecard-storage and scorecard-untar that were accidentally overridden during the release 1.28.1.
• Makefile: Prevent scorecard-storage and scorecard-untar from being rebuilt in the future.

Motivation for the change:

To support the integration of DCI, Preflight, and Operator-SDK in disconnected environments, we have to use the digests and not tags for scorecard-storage and scorecard-untar. We also have to protect these digests from being overwritten during the release process. All the details are here: #6417.

Checklist

If the pull request includes user-facing changes, extra documentation is required:

• Add a new changelog fragment in changelog/fragments (see changelog/fragments/00-template.yaml)
• Add or update relevant sections of the docs website in website/content/en/docs

[acornett21]

@tkrishtop I was going to raise a follow up PR today, thanks for putting this together.

[everettraven]

Thanks @tkrishtop ! The changes look good to me.

/lgtm

Placing a hold until #6422 is merged

/hold

[everettraven]

Closing and reopening to try and pick up the changes that were merged in #6422

[everettraven]

/hold cancel

[tkrishtop]

hi @everettraven I merged the master branch into fix_digests to pick the change of @acornett21

[everettraven]

/lgtm

[everettraven]

Merging as the sanity docs check failures are expected and should be resolved by #6414 . Created a new issue for the ansible molecule e2e: #6433