Implement orbit auto-update automation in Github Actions

[lucasmrod]

To prevent issues like #10300 from happening again the future we need automation that will test the auto-update mechanism of Orbit in every PR where Orbit code is modified.

Fleet and Orbit is the current Orbit automation. We should attempt to add an auto-update check on the three OSs on such Github Action.

If full automation is not possible with Github Actions then we need to document how developers should test the auto-update mechanism in https://github.com/fleetdm/fleet/blob/main/tools/tuf/test/Orbit-auto-update-test-guide.md#L18

[zhumo]

Hi @sharon-fdm, unfortunately we are unable to complete this work in the 6 week SLA. Please feel free to bring this back to Feature Fest if it still remains a priority for stakeholders.