Add vendored-source logic to full release pipeline

[imjasonh]

#1338 added this logic to the nightly release pipeline.

Also add cmd/entrypoint/kodata/ to prevent release pipeline failures.

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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.

/assign @afrittoli

[vdemeester]

/lgtm
/hold

/cc @bobcatfish

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[APPROVALNOTIFIER] This PR is APPROVED

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[bobcatfish]

/lgtm
/hold cancel

/meow space

[bobcatfish]

i wish we had a Task (or even maybe a reusable step??? #1260 ) we could test and reuse for this bit of bash :D

p.s. just a thought - i think i would have made this a separate step? probably just a stylistic difference tho

[tekton-robot]

@bobcatfish:

In response to this:

/lgtm
/hold cancel

/meow space

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