Combine ci-conformance machine deployment + machinepool templates

[willie-yao]

/kind cleanup

What needs cleanup:

Combine ci-conformance templates used for testing to include both md + mp to test both in the same test and reduce testing costs

Files to change: 2

Combine https://github.com/kubernetes-sigs/cluster-api-provider-azure/blob/main/templates/test/ci/cluster-template-prow-ci-version.yaml and https://github.com/kubernetes-sigs/cluster-api-provider-azure/blob/main/templates/test/ci/cluster-template-prow-machine-pool-ci-version.yaml

Anything else you would like to add:
[Miscellaneous information that will assist in solving the issue.]

[willie-yao]

/priority backlog