"verification-mode" field should be removed from pipelines spec

[jkandasa]

Originally verification-mode from pipelines spec was removed in #1481, but upgrade blocked with the following error,

{"level":"info","logger":"tekton-operator-webhook","caller":"webhook/admission.go:151","msg":"remote admission controller audit annotations=map[string]string(nil)","commit":"8e8c163","knative.dev/kind":"operator.tekton.dev/v1alpha1, Kind=TektonConfig","knative.dev/namespace":"","knative.dev/name":"config","knative.dev/operation":"UPDATE","knative.dev/resource":"operator.tekton.dev/v1alpha1, Resource=tektonconfigs","knative.dev/subresource":"","knative.dev/userinfo":"system:serviceaccount:openshift-operators:openshift-pipelines-operator","admissionreview/uid":"958be8bd-9d63-4b95-aa7d-9285684ff86c","admissionreview/allowed":false,"admissionreview/result":"&Status{ListMeta:ListMeta{SelfLink:,ResourceVersion:,Continue:,RemainingItemCount:nil,},Status:Failure,Message:mutation failed: cannot decode incoming old object: json: unknown field \"verification-mode\",Reason:BadRequest,Details:nil,Code:400,}"}

hence verification-mode field added back to pipelines spec with the PR => #1498

verification-mode should be removed, keep this ticket open until verification-mode removed.

[tekton-robot]

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Mark the issue as fresh with /remove-lifecycle stale with a justification.
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If this issue is safe to close now please do so with /close with a justification.
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/lifecycle stale

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[tekton-robot]

Stale issues rot after 30d of inactivity.
Mark the issue as fresh with /remove-lifecycle rotten with a justification.
Rotten issues close after an additional 30d of inactivity.
If this issue is safe to close now please do so with /close with a justification.
If this issue should be exempted, mark the issue as frozen with /lifecycle frozen with a justification.

/lifecycle rotten

Send feedback to tektoncd/plumbing.

[jkandasa]

/lifecycle frozen