avoid import to testing pkg outside of tests

[tonistiigi]

Go deadcode removal is not very smart, especially if other code that imports this pkg uses reflect.

Leaving draft as there is another import via vendor containerd/go-cni#128 . Lmk if you like this in anyway. Eg. buildx does not have imports to go-cni so is only affected by this one.

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[dmcgowan]

Looks like this was originally done this way for fuzz. However the fuzz code moved to test so this is good .

[austinvazquez]

/cherry-pick release/2.0

[k8s-infra-cherrypick-robot]

@austinvazquez: new pull request created: #11833

Details

In response to this:

/cherry-pick release/2.0

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