Ensure exit_json returns failed = False

This is required for modules that may return a non-zero `rc` value for a
successful run, similar to #24865 for Windows fixing **win_chocolatey**.

We also disable the dependency on `rc` value only, even if `failed` was
set.

Adapted unit and integration tests to the new scheme.
Updated raw, shell, script, expect to take `rc` into account.

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

@@ -23,7 +23,7 @@
 
 - assert:
     that:
-      - "'failed' not in result"
+      - "'failed' in result and not result.failed"
 
 - name: command rc 0 failed_when_result False
   shell: exit 0