Sets base image builds to push to private ecr

[jaxesn]

Issue #, if available:

Description of changes:

This changes the distro-base images to push the the private ecr repos instead directly to public during postsubmits and periodics. These private ecr repos are still open to the world (any logged in aws user) for reading, but to ensure we have a check point before updating the tags in public ecr, specifically the "latest" tags, which people may be relying on, we want to push to private first.

The eks-distro-base-tag-files-update-postsubmit job will now use skopeo to mirror the images based on the tags in the EKS_DISTRO_TAG_FILE.yaml to the public ecr repos before opening the PRs in the other repos bumping their respective tag files.

/hold

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[markapruett]

Awaiting ecr creation before this PR is merged.

[eks-distro-bot]

New changes are detected. LGTM label has been removed.

[eks-distro-bot]

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