fix(virtualtype): order in applyGetters and applySetters

[ggurkal]

Summary

Virtual's getter and setter functions are called in reverse order. As for the example below, second function is called first, then the first function called next. However, the opposite would be the logical order.

SomeSchema.virtual('something').get(function() {
  return 'first!';
}).get(function() {
  return 'second';
})

Fixes #8892

[AbdelrahmanHafez]

Welcome @ggurkal

Changing the current tests could mean we're introducing breaking changes, and we have to take those very carefully. Please revert the changes to the current tests and introduce a new test(s) demonstrating what the changes are intended to achieve.

[hasezoey]

@AbdelrahmanHafez from what i see this pr is just extending the test for getters & setters (to also test class inheritance)

[vkarpov15]

Thanks but we'll have to put this change in 6.0. This could be backwards breaking.