Add setup-rule to MinimizeWindowOnAppOpenViaIntent

We need to ensure that all previous tasks (desktop tasks / desks) are
closed when a Desktop E2E test starts.
Utils.testSetupRule() does this through RemoveAllTasksButHomeRule, so add
Utils.testSetupRule() to MinimizeWindowOnAppOpenViaIntent.

We'll add this test rule to TestScenarioBase in a follow-up.

Bug: 421120649
Bug: 411597362
Flag: EXEMPT e2e test
Test: atest MinimizeWindowOnAppOpenViaIntent when Desktop already open
Change-Id: I4e22dfcc455608f01b8967636276f12a5aaaddf1