Remove PipelineResources

[zregvart]

Changes

Removes PipelineResources.

These have been removed from Tekton Pipelines in v0.46.0.

See https://github.com/tektoncd/community/blob/main/teps/0074-deprecate-pipelineresources.md See https://tekton.dev/docs/pipelines/deprecations/#removed-pipelineresources-related-features

Submitter Checklist

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

• Has Docs included if any changes are user facing
• Has Tests included if any functionality added or changed
• Follows the commit message standard
• Meets the Tekton contributor standards (including
  functionality, content, code)
• Release notes block below has been updated with any user facing changes (API changes, bug fixes, changes requiring upgrade notices or deprecation warnings)
• Release notes contains the string "action required" if the change requires additional action from users switching to the new release

Release Notes

PiplelineResource output images are no longer supported.

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: zregvart / name: Zoran Regvart (f7403ef, b67a11b)

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[lcarva]

@zregvart, not yet, it seems: #734

[zregvart]

Duplicate of #764