Add StdoutConfig and StderrorConfig to v1 Step

[lbernick]

Changes

These fields were previously added to v1beta1 Step, and should be present
in the v1 API as well. This commit adds these fields to the v1 package.
(This happened because #4882 was opened before the v1 package was added but merged afterwards.)

/kind misc

Submitter Checklist

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• 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/task_validation.go	97.5%	97.6%	0.0

[abayer]

/approve
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/test check-pr-has-kind-label

[tekton-robot]

@abayer: The specified target(s) for /test were not found.
The following commands are available to trigger required jobs:

• /test pull-tekton-pipeline-alpha-integration-tests
• /test pull-tekton-pipeline-build-tests
• /test pull-tekton-pipeline-integration-tests
• /test tekton-pipeline-unit-tests

The following commands are available to trigger optional jobs:

• /test pull-tekton-pipeline-go-coverage

Use /test all to run all jobs.

In response to this:

/test check-pr-has-kind-label

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[dibyom]

/lgtm