[konflux] support VM override

[ashwindasr]

Ref thread for details

ose-installer-artifacts require more storage, hence a new VM variant was created for ARM

Alongside openshift-eng/ocp-build-data#5798

[ashwindasr]

Tested, works

[openshift-ci]

@ashwindasr: The following test 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/security	729eb98	link	false	/test security

Full PR test history. Your PR dashboard.

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[vfreex]

/lgtm
/approve

[openshift-ci]

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