Add pre/post upgrade test for Model Registry (#1970)

* Add pre/post upgrade test for Model Registry

Signed-off-by: lugi0 <lgiorgi@redhat.com>

* disable component after test execution

Signed-off-by: lugi0 <lgiorgi@redhat.com>

* add comment

Signed-off-by: lugi0 <lgiorgi@redhat.com>

* add teardown step to post upgrade scenario

Signed-off-by: lugi0 <lgiorgi@redhat.com>

* Add sleep before opening workbench

Signed-off-by: lugi0 <lgiorgi@redhat.com>

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Signed-off-by: lugi0 <lgiorgi@redhat.com>