Removing perm-restricted GHA

[kfswain]

We will have to write this using the k8s CI, likely Prow

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kfswain

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• OWNERS [kfswain]

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[nirrozenbaum]

/lgtm

[kfswain]

/cherrypick release-1.3

[k8s-infra-cherrypick-robot]

@kfswain: #2105 failed to apply on top of branch "release-1.3":

Applying: Removing this Action as it requires write permissions, which the K8s org does not allow. We will have to write this using the k8s CI, likely Prow
Using index info to reconstruct a base tree...
M	.github/workflows/non-main-gatekeeper.yml
Falling back to patching base and 3-way merge...
CONFLICT (modify/delete): .github/workflows/non-main-gatekeeper.yml deleted in Removing this Action as it requires write permissions, which the K8s org does not allow. We will have to write this using the k8s CI, likely Prow and modified in HEAD. Version HEAD of .github/workflows/non-main-gatekeeper.yml left in tree.
error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config set advice.mergeConflict false"
Patch failed at 0001 Removing this Action as it requires write permissions, which the K8s org does not allow. We will have to write this using the k8s CI, likely Prow

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In response to this:

/cherrypick release-1.3

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