This test was removed because of its memory footprint.
Most of the memory consummed by the test itself was related to the instantion of test cases in RAM.
With the introduction of case_t which allows tests cases to live in FLASH, the memory footprint has been drastically reduced (860 bytes of RAM saved) and the ticker test can be reintroduced in the code base.
This is temporary, as this test does not fit to some 16kB RAM devices. This requires few more steps: some small devices are using big async HAL structures, RTX changes increased the RAM footprint, plus this test seems to be too big. With all these, it won't fit in RAM regions for some devices.