cluster-api-provider-azure

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What type of PR is this? /kind feature

What this PR does / why we need it:

This PR adds a new cluster template for Flatcar based on systemd-sysexts. The advantages of the implementation is that the clusters can directly consume the vanilla Flatcar SIG images, instead of the Flatcar-K8S images built through image-builder.

The PR is currently in draft stage, as I'm looking into adding the tests for the PR but opening it for early comments.

cc @pothos

Special notes for your reviewer:

• [ ] cherry-pick candidate

TODOs:

• [x] squashed commits
• [x] includes documentation
• [x] adds unit tests

Release note:

Add new flavor `flatcar-sysext` for Flatcar Container Linux cluster deployments.