misc: promote keep-pod-on-cancel to default

[chengjoey]

Changes

promote keep-pod-on-cancel to default

#3238

Submitter Checklist

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

• Has Docs if any changes are user facing, including updates to minimum requirements e.g. Kubernetes version bumps
• Has Tests included if any functionality added or changed
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Release Notes

`keep-pod-on-cancel` feature flag will be enabled in default

[chengjoey]

/kind misc

[tekton-robot]

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[chengjoey]

/test pull-tekton-pipeline-integration-tests
/test pull-tekton-pipeline-alpha-integration-tests
/test pull-tekton-pipeline-beta-integration-tests

[tekton-robot]

@chengjoey: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-tekton-pipeline-integration-tests	142577e	link	true	/test pull-tekton-pipeline-integration-tests
pull-tekton-pipeline-beta-integration-tests	142577e	link	true	/test pull-tekton-pipeline-beta-integration-tests
pull-tekton-pipeline-alpha-integration-tests	142577e	link	true	/test pull-tekton-pipeline-alpha-integration-tests

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