V1: sync v1beta1 changes for pipeline CRDs

[JeromeJu]

Changes

This commit syncs the code updates in v1beta1 for the v1 release.

/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
• 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]

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/pipeline/v1/pipeline_validation.go	98.3%	100.0%	1.7
pkg/apis/pipeline/v1/pipelineref_validation.go	100.0%	78.6%	-21.4
pkg/apis/pipeline/v1/task_validation.go	97.4%	97.4%	0.0

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/pipeline/v1/pipeline_validation.go	98.3%	100.0%	1.7
pkg/apis/pipeline/v1/task_validation.go	97.4%	97.4%	0.0

[tekton-robot]

The following is the coverage report on the affected files.
Say /test pull-tekton-pipeline-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/pipeline/v1/pipeline_validation.go	98.3%	100.0%	1.7
pkg/apis/pipeline/v1/task_validation.go	97.4%	97.4%	0.0

[lbernick]

For reviewers: these differences were introduced in #5170, #5307, #5322, and #5224.

This will need to be synced with #5515.

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: lbernick

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• pkg/apis/OWNERS [lbernick]

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[abayer]

/lgtm