autoupdate rollout: honour the maintenance window duration #50745
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This PR copies the maintenance duration from the config into the rollout spec. Changing the maintenance duration does not reset the rollout.
The duration from the rollout is now used to estimate if the current time is inside the maintenance window (before we were trucating by the minute, so the maintenance duration was always 1 hour.
Part of: RFD-184
Goal (internal): https://github.com/gravitational/cloud/issues/10289