force an amd64 node selector on the prowjob's pod spec

[droslean]

https://redhat-internal.slack.com/archives/CBN38N3MW/p1727097810793429

/cc @bradmwilliams

[openshift-ci[bot]]

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[openshift-ci[bot]]

@droslean: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/govulncheck	2e701578f544595a5031e91179ba0ddb4c29203c	link	false	/test govulncheck
ci/prow/security	2e701578f544595a5031e91179ba0ddb4c29203c	link	false	/test security

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[bradmwilliams]

/hold We're going to run with #502 in hopes that get's us working with arm64 nodes. If all else fails, we'll merge this PR and force all clusterbot jobs to run on amd64 until we can fully support arm64.