config custom resource is not accepting `default-forbidden-env`

Description of problem:{}

config custom resource is not accepting `default-forbidden-env`

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

1. Install the latest build of Openshift Pipelines 1.10.0
2. Try to add `default-forbidden-env: "TEST_TEKTON"` under pipeline section in config custom resource

Actual results:

Updating config custom resource is failing with error

error: tektonconfigs.operator.tekton.dev "config" could not be patched: admission webhook "webhook.operator.tekton.dev" denied the request: mutation failed: cannot decode incoming new object: json: unknown field "default-forbidden-env" 

Expected results:

Config resource should get updated

Reproducibility (Always/Intermittent/Only Once):

Always

Build Details:

Additional info (Such as Logs, Screenshots, etc):