[developer productivity improvement] Running awx components in vscode debugger (#14942)

Enable VSCode debugger integration when attaching VSCode to with AWX docker-compose development environment container

- add debugpy launch target in `.vscode/launch.json` to enable launching awx processes with debugpy
- add vscode tasks in `.vscode/tasks.json` to facilitate shutting down corresponding supervisord managed processes while launching process with debugpy
- modify nginx conf to add django runserver as fallback to uwsgi (enable launching API server via debugpy)

tools/docker-compose/ansible/roles/sources/templates/nginx.conf.j2

@@ -29,6 +29,10 @@ http {
         server localhost:8050;
     }
 
+    upstream runserver {
+        server localhost:8052;
+    }
+
     upstream daphne {
         server localhost:8051;
     }

tools/docker-compose/ansible/roles/sources/templates/nginx.locations.conf.j2

@@ -38,4 +38,12 @@ location {{ ingress_path }} {
     uwsgi_read_timeout 120s;
     uwsgi_pass uwsgi;
     include /etc/nginx/uwsgi_params;
+    error_page 502 = @fallback;
+}
+
+# Enable scenario where we shutdown uwsgi and launching runserver for debugging purposes
+location @fallback {
+    # Add trailing / if missing
+    rewrite ^(.*)$http_host(.*[^/])$ $1$http_host$2/ permanent;
+    proxy_pass http://runserver;
 }