Revert "config: prefixes image names with ko:// scheme"

[afrittoli]

Changes

This reverts commit c903e5d.
The change is require to be able to release until the issue is fixed on ko side.

Submitter Checklist

These are the criteria that every PR should meet, please check them off as you
review them:

• Includes tests (if functionality changed/added)
• Includes docs (if user facing)
• Commit messages follow commit message best practices

See the contribution guide for more details.

Double check this list of stuff that's easy to miss:

• If you are adding a new binary/image to the cmd dir, please update
  the release Task to build and release this image.

Reviewer Notes

If API changes are included, additive changes must be approved by at least two OWNERS and backwards incompatible changes must be approved by more than 50% of the OWNERS, and they must first be added in a backwards compatible way.

Release Notes

Do not use the ko:// scheme in manifests

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[tekton-robot]

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Available kind/ labels are:

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[afrittoli]

@sbwsg @bobcatfish

[dibyom]

/approve
/lgtm

[tekton-robot]

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