fix(ngMock): reset cache before every test
fix(ngMock): reset cache before every test

We don't need to have values in the cache from previous tests. This was
causing failures in all subsequent tests when a single test failed due
to a memory leak.

Now that we reset the cache each time we do not need to store the cache
size at the start of each test

Closes #13013

Smartbank/angular.js,Smartbank/angular.js,Smartbank/angular.js,Smartbank/angular.js