More file refactoring (#40114)

* Set src in the state functions rather than the toplevel

A good API should only require passing one version of a piece of data
around so do that for src

* Move the rewriting of path into additional_parameter_handling

When the path is a directory we can rewrite the path to be a file inside
of the directory

* Emit a warning when src is used with a state where it should be ignored

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

@@ -134,7 +134,9 @@
       - "file6_result.changed == true"
 
 - name: touch a hard link
-  file: src={{output_file}} dest={{output_dir}}/hard.txt state=touch
+  file:
+    dest: '{{ output_dir }}/hard.txt'
+    state: 'touch'
   register: file6_touch_result
 
 - name: verify that the hard link was touched