Migrate remaining nosetests

• rename nose directories to pytest where tests already ran with pytest
• migrate few remaining nosetests dependencies to pytest
• remove support for nosetests in gaudi_add_tests (now in !1520 (merged))

GaudiExamples/tests/scripts/test_compat_aliases.py

 #!/usr/bin/env python3
 #####################################################################################
-# (c) Copyright 1998-2019 CERN for the benefit of the LHCb and ATLAS collaborations #
+# (c) Copyright 1998-2023 CERN for the benefit of the LHCb and ATLAS collaborations #
 #                                                                                   #
 # This software is distributed under the terms of the Apache version 2 licence,     #
 # copied verbatim in the file "LICENSE".                                            #
@@ -52,9 +52,4 @@ def test_aliases():
 
 
 if __name__ == "__main__":
-    import sys
-
-    import nose
-
-    sys.stderr = sys.stdout  # redirect nose output to stdout
-    nose.main(defaultTest=sys.argv[0])
+    test_aliases()