Add force browser to stop waiting for debugger

When Browser doesn't want a target to be attached, Connection tells the
browser to stop waiting for debugger. This prevents the browser from
indefinitely waiting for a target (that we don't want) to be attached.

common/connection.go

@@ -345,6 +345,7 @@ func (c *Connection) recvLoop() {
 				// if a session should be created for the target.
 				ok := c.onTargetAttachedToTarget(sid, eva)
 				if !ok {
+					c.stopWaitingForDebugger(sid)
 					continue
 				}
 			}