Improve cloudstack provider tests with validator mocks

**What would you like to be added**:
Currently, the cloudstack provider tests rely on wildcard dependencies to keep the test initialization light and simple. However, this reduces the coverage of the tests.

**Why is this needed**:
We should refactor the provider tests so that we can assert on dependency calls more easily instead of using wildcard dependencies.

Start by locating the CloudStack provider tests and the wildcard dependencies used during test initialization, then run the existing provider test suite. Replace the wildcard setup with validator mocks so dependency calls can be asserted; done means the tests retain their coverage while verifying those calls explicitly.

Written by the indexing model from the issue text.