[PR #427/0a68bb27 backport][stable-1] CI is changed (#428)

* Is changed (#427)

* Refactor tests to use "is" and "is not" changed

* Refactor tests to use is succeeded or is failed

* Reformat indentation

* Add filter "bool" to prevent issues

(cherry picked from commit 0a68bb270f)

* Fix error message verification

I don't know why this works on main, but in stable-1, the error message
is "invalid privileges string: Invalid privileges specified:
frozenset({'INVALID'})"

* Add filter for test that won't work with mariadb

* Refactor test in their own file instead of main

* Add db_names dict

* Fix registered variable name

* Add missing fact

* Add test databases cleanup

* Cut tests for unsupported db name (%)

* Add missing default vars to tests db_formats

* Backport small diff from main

tests/integration/targets/test_mysql_user/tasks/remove_user.yml

@@ -37,7 +37,7 @@
     - name: assert output message mysql user was removed
       assert:
         that:
-          - "result.changed == true"
+          - result is changed
 
     # ============================================================
     - name: create blank mysql user to be removed later
@@ -58,7 +58,7 @@
     - name: assert changed is true for removing all blank users
       assert:
         that:
-          - "result.changed == true"
+          - result is changed
 
     - name: remove blank mysql user with hosts=all (expect ok)
       mysql_user:
@@ -71,4 +71,4 @@
     - name: assert changed is true for removing all blank users
       assert:
         that:
-          - "result.changed == false"
+          - result is not changed