🐛 fix a bug in multinamespaced cache implementation

[alebedev87]

This is a cherry-pick of #2252.

This commit fixes a bug that was brought in long ago in #1520. When the object's scope is not deterministic from the RESTMapper it should return an error instead of ignoring it.

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[vincepri]

The release-0.14 is the current stable branch, are you able to update instead of backporting?

[alebedev87]

@vincepri: The Kube API dependencies in 0.14 and 0.13 are different: 0.26 and 0.25 respectively. The latest version of our product (OpenShift) available to the customers uses the controller runtime 0.13. Updating controller-runtime to the KubeAPI which is not yet available to our customers (no release with Kube 0.26 is done yet) would cause some technical and likely conceptual problems.

[vincepri]

/ok-to-test

[vincepri]

/approve
/lgtm

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alebedev87, vincepri

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