Added win_copy recursive integration test with trailing path separator. (#24523)

This is a reproducer for https://github.com/ansible/ansible/issues/23559

Tests will fail until https://github.com/ansible/ansible/pull/23581 is merged

Note that I believe another commit is also needed for this to work,
specifically the change from: https://github.com/ansible/ansible/pull/23326
(cherry picked from commit b46c098581)

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

@@ -162,6 +162,50 @@
     that:
     - not recursive_copy_result_again|changed
 
+# Recursive folder copy with trailing slash (see issue 23559)
+
+
+- name: make an output subdirectory
+  win_file:
+    path: "{{win_output_dir}}\\subtrailing\\"
+    state: directory
+
+- name: test recursive copy to directory
+  win_copy:
+    src: subdir/
+    dest: "{{win_output_dir}}\\subtrailing\\"
+  register: recursive_copy_result2
+
+- name: get stats on files within sub directory
+  win_find:
+    paths: "{{win_output_dir}}\\subtrailing\\"
+    recurse: True
+  register: recurse_find_results2
+
+- name: assert recursive copy worked
+  assert:
+    that:
+    - recursive_copy_result2|changed
+    - recurse_find_results2.examined == 6 # checks that it found 3 folders and 3 files.  
+# Note this is different from the test above because, by including the trailing
+# slash on the source, we only get the *contents* of the source folder
+# without the trailing slash, we would get the source folder *and* its
+# contents.  
+# See 'src' parameter documentation 
+# here: http://docs.ansible.com/ansible/win_copy_module.html
+
+- name: test recursive copy to directory again with source slash
+  win_copy:
+    src: subdir/
+    dest: "{{win_output_dir}}\\subtrailing\\"
+  register: recursive_copy_result_again2
+
+- name: assert recursive copy worked
+  assert:
+    that:
+    - not recursive_copy_result_again2|changed
+
+# test 'content' parameter
 - name: create file with content
   win_copy:
     content: abc