Improve the LaunchSingleInstance in cvd start#2812
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This change improves the robustness of the single-instance boot (LaunchSingleInstance) in
cvd start:Refine Bypass Validation Checks:
- Prevented bypass if the user requests foreground mode (
--daemon=false), sinceLaunchSingleInstancedoes not implement foreground log tailing.- Prevented bypass if any configuration-altering flags are passed (only
--daemonis considered safe), ensuringassemble_cvdis not skipped when config changes are requested.- Enforce that the main instance itself cannot bypass the full boot, and that the main instance must be in
RUNNINGstate before a secondary instance is allowed to use the fast-track bypass.