adding quiet option to assert (ansible#27124) (#52032)

* adding quiet option to assert (ansible#27124)

* adding doc for quiet to assert.py

* fixing PEP8 failure

* improving example

* improving docs

* adding changelog fragment

* adding . at end of descriptions

* removing trailing blank line

* adding integration test for assert

* fixing CI complaints

* disabling gather_facts in quiet.yml test

* rerunning to capture skip

* cleaning up python 2 vs 3

* following rebase

* fixing CI complaints

* fixing CI complaints

* fixing CI complaints

* fixing CI complaints

* fixing CI complaints

test/integration/targets/assert/assert_quiet.out.quiet.stdout

@@ -0,0 +1,16 @@
+
+PLAY [localhost] ***************************************************************
+
+TASK [assert] ******************************************************************
+ok: [localhost] => (item=item_A)
+
+TASK [assert] ******************************************************************
+ok: [localhost] => (item=item_A) => {
+    "changed": false,
+    "item": "item_A",
+    "msg": "All assertions passed"
+}
+
+PLAY RECAP *********************************************************************
+localhost                  : ok=2    changed=0    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0
+