METAL-1230: Add support for aarch64 workers on x86

[honza]

Similar to regular workers, we can now say:

export NUM_ARM_WORKERS=${NUM_ARM_WORKERS:-"0"}

And if you use a multi-arch payload, you can inspect aarch64 nodes on x86 using qemu emulation. Qemu emulation of aarch64 workers was recently merged in metal3-dev-env upstream so we bump the version here.

Assisted by Claude, tested by hand on my machine.

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[honza]

/test images

[openshift-ci]

@honza: 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/e2e-agent-sno-ipv6	39e09e2	link	false	/test e2e-agent-sno-ipv6
ci/prow/e2e-agent-compact-ipv4-iso-no-registry	39e09e2	link	false	/test e2e-agent-compact-ipv4-iso-no-registry

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