Tests for user name requirements

Summary

https://gitlab.indiscale.com/caosdb/customers/leibniz-zmt/management/-/issues/95

https://gitlab.indiscale.com/caosdb/customers/leibniz-zmt/management/-/issues/94

Test Environment

How to set up a test environment for manual testing?

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tests/test_issues_server.py

@@ -997,4 +997,4 @@ def test_142():
             admin._delete_user(name=name)
         assert cm.value.status == 400
         assert cm.value.msg.startswith(
-            "The user name does not comply with the policies for user names")
+            "The user name does not comply with the current policies for user names")