[incidental_setup_rabbitmq] [2.11] Remove main (#74728)

Change:
- This file got missed in bcd7b61c03 /
  #74715 somehow.

Test Plan:
- If CI passes, it worked.

Signed-off-by: Rick Elrod <rick@elrod.me>

test/integration/targets/incidental_setup_rabbitmq/tasks/main.yml

@@ -1,5 +0,0 @@
----
-- include: ubuntu.yml
-  when:
-    - ansible_distribution == 'Ubuntu'
-    - ansible_distribution_release != 'focal'