correct, cleanup & simplify dwim stack (#25956)

* correct, cleanup & simplify dwim stack

latlh chIS logh HeS qar wej chel laD
better errors
update find_file to new exception

* addressed latest comments

* test should not use realpath as it follows symlink

this fails when on OS X as /var is now a symlink to /private/var
but first_found was not supposed to follow symlinks

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

@@ -216,10 +216,10 @@
     - "{{ output_dir + '/bar1' }}"
 
 - name: set expected
-  set_fact: first_expected="{{ output_dir | expanduser | realpath + '/foo1' }}"
+  set_fact: first_expected="{{ output_dir | expanduser + '/foo1' }}"
 
 - name: set unexpected
-  set_fact: first_unexpected="{{ output_dir | expanduser | realpath + '/bar1' }}"
+  set_fact: first_unexpected="{{ output_dir | expanduser + '/bar1' }}"
 
 - name: verify with_first_found results
   assert:

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

@@ -329,7 +329,7 @@
     src: false-file
     dest: "{{win_output_dir}}\\fale-file.txt"
   register: fail_missing_source
-  failed_when: fail_missing_source.msg != "Unable to find 'false-file' in expected paths."
+  failed_when: not (fail_missing_source|failed)
 
 - name: fail when copying remote src file when src doesn't exist
   win_copy: