refact(controller): Decouple listeners/servers shutdown from Worker

In general, these changes were introduced in the same vein of the
changes to controller `startListeners`.

Specifically, these changes also decouple the Controller and the Worker
shutdown processes. Currently, a call to `stopListeners` on an instance
that is running as both a Controller and a Worker would stop the
listeners for both.

Lastly, we also add unit/integration tests to the shutdown code.

internal/cmd/commands/dev/dev.go

@@ -618,7 +618,7 @@ func (c *Command) Run(args []string) int {
 
 		if err := c.controller.Start(); err != nil {
 			retErr := fmt.Errorf("Error starting controller: %w", err)
-			if err := c.controller.Shutdown(false); err != nil {
+			if err := c.controller.Shutdown(); err != nil {
 				c.UI.Error(retErr.Error())
 				retErr = fmt.Errorf("Error shutting down controller: %w", err)
 			}
@@ -647,7 +647,7 @@ func (c *Command) Run(args []string) int {
 				retErr = fmt.Errorf("Error shutting down worker: %w", err)
 			}
 			c.UI.Error(retErr.Error())
-			if err := c.controller.Shutdown(false); err != nil {
+			if err := c.controller.Shutdown(); err != nil {
 				c.UI.Error(fmt.Errorf("Error with controller shutdown: %w", err).Error())
 			}
 			return base.CommandCliError
@@ -684,7 +684,7 @@ func (c *Command) Run(args []string) int {
 				}
 			}
 
-			if err := c.controller.Shutdown(false); err != nil {
+			if err := c.controller.Shutdown(); err != nil {
 				c.UI.Error(fmt.Errorf("Error shutting down controller: %w", err).Error())
 			}