Disable agent okd scos jobs

[andfasano]

Right now the agent okd scos jobs are perma-broken, and until a SCOS boot image will be available (see here) it's better to save CI resources - since right now for every PR they are usually triggered.
They could be readded once the SCOS support will be available/planned.

[andfasano]

cc @LorbusChris @vrutkovs

[vrutkovs]

Oh, I assumed 'optional: true' would override 'run_if_changed: true'.

/lgtm

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