Don't pollute include_variables (#54687)

* Don't pollute include_variables. Fixes #51667. Fixes #54618.

* Rename include_variables to include_args, so we can make the distinction about what they are

* Track args and vars separately

* oops

* oops again

* linting fix

* Add test

test/integration/targets/include_import/roles/loop_name_assert/tasks/main.yml

@@ -0,0 +1,4 @@
+- assert:
+    that:
+      - name == 'name_from_loop_var'
+      - name != 'loop_name_assert'

test/integration/targets/include_import/runme.sh

@@ -94,3 +94,6 @@ test "$(egrep -c 'include handler task|ERROR! The requested handler '"'"'do_impo
 # https://github.com/ansible/ansible/issues/49969
 ansible-playbook -v parent_templating/playbook.yml 2>&1 | tee test_parent_templating.out
 test "$(egrep -c 'Templating the path of the parent include_tasks failed.' test_parent_templating.out)" = 0
+
+# https://github.com/ansible/ansible/issues/54618
+ansible-playbook test_loop_var_bleed.yaml "$@"

test/integration/targets/include_import/test_loop_var_bleed.yaml

@@ -0,0 +1,9 @@
+- hosts: localhost
+  gather_facts: false
+  tasks:
+    - include_role:
+        name: loop_name_assert
+      loop:
+        - name_from_loop_var
+      loop_control:
+        loop_var: name