Disable testEnableRollbackTimeoutFailsRollback test.

The test is flaky because it is testing a race condition.

The flakiness is fixed with the help of some new @TestApi in
I01f3e769711ffa51fa714ff4bc81e70887f427ad. Disable the test on those
branches without the fix merged.

Bug: 134373106
Bug: 136605788
Test: atest RollbackTest

Change-Id: I05edfc142c14631b259ae7aaf2dd31af00363a35
Merged-In: I01f3e769711ffa51fa714ff4bc81e70887f427ad