[TEST] dev/core#1394 - Avoid duplicate activity types in tests that use CiviCaseTestCase

[demeritcowboy]

Overview

https://lab.civicrm.org/dev/core/issues/1394
CiviCaseTestCase can create duplicate option values in setup() so you can end up with multiple activity type option values with the same name.

[civibot]

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[seamuslee001]

This only affects tests and Jenkins is good with it then so am i

[demeritcowboy]

Thanks!