cloudbuild.yaml: increase timeout to 2400s

[marquiz]

20 minutes was not clearly enough for multiarch buildx build.

[k8s-ci-robot]

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[zvonkok]

/lgtm

[marquiz]

Another short-circuit:
/override pull-node-feature-discovery-build-image

[k8s-ci-robot]

@marquiz: Overrode contexts on behalf of marquiz: pull-node-feature-discovery-build-image

In response to this:

Another short-circuit:
/override pull-node-feature-discovery-build-image

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