[Observability Onboarding] fix docker integration double detection (e…

…lastic#199237)

Closes elastic#195912

See:
elastic#195912 (comment)
(cherry picked from commit 4c61876)

x-pack/plugins/observability_solution/observability_onboarding/public/assets/auto_detect.sh

@@ -329,6 +329,7 @@ read_open_log_file_list() {
     "^\/var\/log\/redis\/"
     "^\/var\/log\/rabbitmq\/"
     "^\/var\/log\/kafka\/"
+    "^\/var\/lib\/docker\/"
     "^\/var\/log\/mongodb\/"
     "^\/opt\/tomcat\/logs\/"
     "^\/var\/log\/prometheus\/"