[release-1.14] Avoid fatal errors for unknown features flags that can be added in a future release

knative-prow-robot commented 3 months ago

This is an automated cherry-pick of #8051

knative-prow[bot] commented 3 months ago

[APPROVALNOTIFIER] This PR is APPROVED

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pierDipi commented 3 months ago

/test upgrade-tests

knative / eventing

[release-1.14] Avoid fatal errors for unknown features flags that can be added in a future release #8052