unit_start() advertises that start requests don't get suppressed, so that it could be used to manually speed up auto restarts. However, service_start() so far rejected this, stating that clients should issue restart request in order to trigger BindsTo=/OnFailure=. That seems to be a red herring though, because for a long time the service states between auto-restarts were buggy (#27594). With the introduction of RestartMode=direct, the behavior is sane again and customizable, hence I see no reason to refuse this anymore. Whether those deps are triggered solely depends on RestartMode= now. Plus, filter out some intermediate states that should never be seen in service_start(). Fixes #33890
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