Not all users of the E2E framework want to run cloud-provider specific
tests. By splitting out the code it becomes possible to decide in
a E2E test suite which providers are supported.

This is achieved in two ways:
- the framework calls certain functions through a provider
  interface instead of calling specific cloud provider functions
  directly
- tests that are cloud-provider specific directly import the
  new provider packages

The ingress test utilities are only needed by a few tests. Splitting
them out into a separate package makes the framework simpler for test
suites not using those tests.

Fixes: #66649