Chore: Avoid stopping plugin (#74654)

pkg/plugins/manager/fakes/fakes.go

@@ -496,13 +496,17 @@ type FakeBackendPlugin struct {
 	Decommissioned bool
 	Running        bool
 
+	// ExitedCheckDoneOrStopped is used to signal that the Exited() or Stop() method has been called.
+	ExitedCheckDoneOrStopped chan struct{}
+
 	mutex sync.RWMutex
 	backendplugin.Plugin
 }
 
 func NewFakeBackendPlugin(managed bool) *FakeBackendPlugin {
 	return &FakeBackendPlugin{
-		Managed: managed,
+		Managed:                  managed,
+		ExitedCheckDoneOrStopped: make(chan struct{}),
 	}
 }
 
@@ -519,6 +523,7 @@ func (p *FakeBackendPlugin) Stop(_ context.Context) error {
 	defer p.mutex.Unlock()
 	p.Running = false
 	p.StopCount++
+	go func() { p.ExitedCheckDoneOrStopped <- struct{}{} }()
 	return nil
 }
 
@@ -544,6 +549,7 @@ func (p *FakeBackendPlugin) IsManaged() bool {
 func (p *FakeBackendPlugin) Exited() bool {
 	p.mutex.RLock()
 	defer p.mutex.RUnlock()
+	go func() { p.ExitedCheckDoneOrStopped <- struct{}{} }()
 	return !p.Running
 }