test(ivy): enable router tests with pending timers (FW-768)

[marclaval]

These two tests are failing because there are some pending timers in zone at the end of the tests.
The reasons are:

1. the RouterOutlet.activateWith(...) marks for check to force change detection, see https://github.com/angular/angular/blob/master/packages/router/src/directives/router_outlet.ts#L137-L140
2. In Ivy, marking a view dirty also schedules a change detection, see https://github.com/angular/angular/blob/master/packages/core/src/render3/instructions.ts#L2376-L2386
3. In Ivy in Node, scheduling is done with setTimeout

In this list, the second one is the questionable one that should be discussed.
This PR can be merged to enable these tests which are in fact successful, or used for the discussion.

[mary-poppins]

You can preview f55d0e4 at https://pr27509-f55d0e4.ngbuilds.io/.

[mary-poppins]

You can preview f8026f9 at https://pr27509-f8026f9.ngbuilds.io/.

[angular-automatic-lock-bot]

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