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I think you need to do this:

ros2 run robot_control vehicle --ros-args -r __ns:=/drone_0 --log-level drone_0.vehicle:=DEBUG

To get it to work.

To test this, I modified the talker demo in the demo_nodes_cpp package, like this:

diff --git a/demo_nodes_cpp/src/topics/talker.cpp b/demo_nodes_cpp/src/topics/talker.cpp
index 30f97a0..01756d0 100644
--- a/demo_nodes_cpp/src/topics/talker.cpp
+++ b/demo_nodes_cpp/src/topics/talker.cpp
@@ -44,6 +44,7 @@ public:
       {
         msg_ = std::make_unique<std_msgs::msg::String>();
         msg_->data = "Hello World: " + std::to_string(count_++);
+        RCLCPP_DEBUG(this->get_logger(), "Publishing: '%s'", msg_->data.c_str());
         RCLCPP_INFO(this->get_logger(), "Publishing: '%s'", msg_->data.c_str());
         // Put the message into a queue to be processed by the middleware.
         // This call is non-blocking.

And to reproduce what you were trying to do, I did this:

$ ros2 run demo_nodes_cpp talker --ros-args -r __ns:=/drone_0 --log-level talker:=DEBUG
[DEBUG] [1625186542.873545147] [talker]: Load library libtopics_library.so
[DEBUG] [1625186542.875355119] [talker]: Instantiate class rclcpp_components::NodeFactoryTemplate<demo_nodes_cpp::Talker>
1625186542.876201 [87]     talker: using network interface enp0s5 (udp/10.211.55.6) selected arbitrarily from: enp0s5, docker0
[INFO] [1625186543.880863775] [drone_0.talker]: Publishing: 'Hello World: 1'
...

$ ros2 run demo_nodes_cpp talker --ros-args -r __ns:=/drone_0 --log-level drone_0.talker:=DEBUG
1625186556.836825 [87]     talker: using network interface enp0s5 (udp/10.211.55.6) selected arbitrarily from: enp0s5, docker0
[DEBUG] [1625186557.841640933] [drone_0.talker]: Publishing: 'Hello World: 1'
[INFO] [1625186557.841909375] [drone_0.talker]: Publishing: 'Hello World: 1'

Note that even though the node name is /drone_0/talker (as reported by ros2 node list), the logger name is separated by . instead of /.