flatpak - allow to add/remove multiple flatpaks at once (#2521)

* reviving flatpack PR

* added changelog fragment

* adjusted integration tests per PR

* adjusted examples to use the full name of the module

* Use new local artifacts.

* Re-add StrictVersion import.

* Try to clean up PR.

* ...

* Use original name in installed/not installed list.

* More fixes.

* Work around flatpak bug.

* Fix bug I introduced.

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

tests/integration/targets/flatpak/tasks/setup.yml

@@ -36,7 +36,9 @@
 
 - name: Remove (if necessary) flatpak for testing check mode on absent flatpak
   flatpak:
-    name: com.dummy.App1
+    name:
+      - com.dummy.App1
+      - com.dummy.App3
     remote: dummy-remote
     state: absent
     no_dependencies: true