test: reuse acceptance tests across Scriptless and Machine API modes

[comtalyst]

Existing acceptance test infrastructure tests Scriptless and AKS Machine API modes with different set of tests.
This may result in unintended branch-out between two modes. Instead, the tests could be shared with by-design differences reflected in the test implementation.
With the direction being to extend the support of non-machine modes, this reasoning is holding more weight.

In this PR, we share the test primarily by:

• Extending the AKS Machine API tests in cloudprovider module to be compatible with Scriptless
  • E.g., the ones that are validating AKS Machine API calls will validate CRP calls instead for non-machine modes
• Move non-machine acceptance tests in instancetype to cloudprovider module, given the tests are testing end-to-end provisioning rather than instancetype's specific functionality.
• Either merge them with existing AKS Machine API tests, or extend it to be compatible with AKS Machine API modes
• Run the same suites of test on multiple context, where each context setup a mode

Fixes #

Description

How was this change tested?

Does this change impact docs?

• Yes, PR includes docs updates
• Yes, issue opened: #
• No

Release Note