Re-enable testFinishPrimary/Secondary tests.

These tests are no longer flaky which is possibly
fixed by bundle_client_transaction_flag.

Fix: 332251465
Fix: 302192873
Fix: 302112669
Flag: TEST_ONLY
Test: atest ActivityEmbeddingFinishTests#testFinishPrimary,testFinishSecondary
Change-Id: Icbdac728311e4b0884ae79c475f4edab361dd81d