Remove upgrade test from Azure CI
    
    It is already running in PR CI for all kinds of targets:
    
    ipatests/prci_definitions/gating.yaml:        test_suite: test_integration/test_upgrade.py
    ipatests/prci_definitions/nightly_latest.yaml:        test_suite: test_integration/test_upgrade.py
    ipatests/prci_definitions/nightly_latest_389ds.yaml:        test_suite: test_integration/test_upgrade.py
    ipatests/prci_definitions/nightly_latest_pki.yaml:        test_suite: test_integration/test_upgrade.py
    ipatests/prci_definitions/nightly_latest_selinux.yaml:        test_suite: test_integration/test_upgrade.py
    ipatests/prci_definitions/nightly_latest_testing.yaml:        test_suite: test_integration/test_upgrade.py
    ipatests/prci_definitions/nightly_latest_testing_selinux.yaml:        test_suite: test_integration/test_upgrade.py
    ipatests/prci_definitions/nightly_previous.yaml:        test_suite: test_integration/test_upgrade.py
    ipatests/prci_definitions/nightly_rawhide.yaml:        test_suite: test_integration/test_upgrade.py
    
    Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
    Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>