[PR #8387/da2c87ce backport][stable-9] fix test helper handling of rc (#8414)

fix test helper handling of rc (#8387)

* fix test helper handling of rc

* fix side_effect logic for rc != 0

* fix side_effect func + sanity tests

* fix ignore files

* fix code

* revamp the generator for run_command calls returns in testcase

* remove unused import

* Update tests/sanity/ignore-2.18.txt

Co-authored-by: Felix Fontein <felix@fontein.de>

* Update tests/sanity/ignore-2.17.txt

Co-authored-by: Felix Fontein <felix@fontein.de>

---------

Co-authored-by: Felix Fontein <felix@fontein.de>
(cherry picked from commit da2c87ce0d)

Co-authored-by: Alexei Znamensky <103110+russoz@users.noreply.github.com>

tests/unit/plugins/modules/test_django_command.yaml

@@ -30,8 +30,6 @@
     settings: whatever.settings
   output:
     failed: true
-  flags:
-    xfail: not seem to be failing as it should
   run_command_calls:
     - command: [/testbin/python, -m, django, check, --no-color, --settings=whatever.settings, babaloo, yaba, daba, doo]
       environ: *env-def