Add V1 version to Task CRD

[lbernick]

Changes

This commit adds a v1 version of the Task CRD, and support to the webhook.
Since this version is not served, it will not be available to users.

/kind misc

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• n/a Has Docs included if any changes are user facing
• n/a Has Tests included if any functionality added or changed
• Follows the commit message standard
• Meets the Tekton contributor standards (including
  functionality, content, code)
• Has a kind label. You can add one by adding a comment on this PR that contains /kind <type>. Valid types are bug, cleanup, design, documentation, feature, flake, misc, question, tep
• n/a Release notes block below has been updated with any user facing changes (API changes, bug fixes, changes requiring upgrade notices or deprecation warnings)
• n/a Release notes contains the string "action required" if the change requires additional action from users switching to the new release

Release Notes

NONE

[tekton-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[lbernick]

Needs #5202

[jerop]

workspace-in-sidecar is a known flake #4169

/retest

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jerop

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• OWNERS [jerop]

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[abayer]

/retest

[abayer]

/lgtm