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

test/units/playbook/test_included_file.py

@@ -51,11 +51,12 @@ def mock_variable_manager():
 def test_included_file_instantiation():
     filename = 'somefile.yml'
 
-    inc_file = IncludedFile(filename=filename, args=[], task=None)
+    inc_file = IncludedFile(filename=filename, args={}, vars={}, task=None)
 
     assert isinstance(inc_file, IncludedFile)
     assert inc_file._filename == filename
-    assert inc_file._args == []
+    assert inc_file._args == {}
+    assert inc_file._vars == {}
     assert inc_file._task is None
 
 
@@ -84,6 +85,7 @@ def test_process_include_results(mock_iterator, mock_variable_manager):
     assert res[0]._filename == os.path.join(os.getcwd(), 'include_test.yml')
     assert res[0]._hosts == ['testhost1', 'testhost2']
     assert res[0]._args == {}
+    assert res[0]._vars == {}
 
 
 def test_process_include_diff_files(mock_iterator, mock_variable_manager):
@@ -124,6 +126,9 @@ def test_process_include_diff_files(mock_iterator, mock_variable_manager):
     assert res[0]._args == {}
     assert res[1]._args == {}
 
+    assert res[0]._vars == {}
+    assert res[1]._vars == {}
+
 
 def test_process_include_simulate_free(mock_iterator, mock_variable_manager):
     hostname = "testhost1"
@@ -159,3 +164,6 @@ def test_process_include_simulate_free(mock_iterator, mock_variable_manager):
 
     assert res[0]._args == {}
     assert res[1]._args == {}
+
+    assert res[0]._vars == {}
+    assert res[1]._vars == {}