Add automated test for "Delete user with Script or Programming Rights"

The manual test is here: https://test.xwiki.org/xwiki/bin/view/Administration%20Tests/Delete%20user%20with%20Script%20or%20Programming%20Rights

The test verifies that if deleting an user with Script and/or Programming rights displays a warning properly.

Matrix discussion: https://matrix.to/#/!ikPtGZaGWtyblizzlR:matrix.xwiki.com/$16166704539725sfxVi:matrix.xwiki.com?via=matrix.org&via=matrix.xwiki.com&via=dodsorf.as

Vincent Massol: Ilie Andriuta: I'm on it to verify
one trick you should know to find out if a test exists:
try finding the Release Change item corresponding to it
Found it here I think: https://www.xwiki.org/xwiki/bin/view/ReleaseNotes/Data/XWiki/11.3RC1/Change002/
this gives you the version of XWiki where the feature or improvement was introduced: XWiki 11.3RC1 here
Search jira to find the jira issue corresponding to it
Here it would be fixVersion = 11.3-rc-1 and category = 10000which leads to https://jira.xwiki.org/browse/XWIKI-16361
Check the commits (in the jira issue) and see if a test was modified or added
commit 1= https://github.com/xwiki/xwiki-platform/commit/48cf8efe3e3f98c8f85c663242dffafecd79140c
commit 2= https://github.com/xwiki/xwiki-platform/commit/41d47d0d540d158000b4ac8c828276baf3ae55c0
so
commit1 shows no tests
and commit2 shows some test change in UsersGroupsRightsManagementTest.java but nothing about testing the change
unfortunately ...
We can also see Marius Dumitru Florea did this
so you also get the name of the dev to check with
so basically all this new velocity code is untested Marius Dumitru Florea : https://github.com/xwiki/xwiki-platform/commit/48cf8efe3e3f98c8f85c663242dffafecd79140c#diff-c97001dbb0891398a72b4ba8c826749448f915c3fadcb26543a5cae0b5ea0970R171-R498
right?
Ilie Andriuta: Thanks for the trick, but this is for fairly new features, right?
Vincent Massol: Ilie Andriuta: yes
since the time we started introducing relase notes
Ilie Andriuta: there are more places where a test can be found though
Vincent Massol: so not that recent either
Ilie Andriuta: yes it's not perfect, it's just one more trick
(that's how I did it the analysis here for ex)
Marius Dumitru Florea: I don't recall, but judging by

and commit2 shows some test change in UsersGroupsRightsManagementTest.java but nothing about testing the change

I'd say it's not tested

Ilie Andriuta: I should create a task for it then
thanks