Cluster API expects the user data secret created by the installer to contain a `format: ignition` value. This is used by the various providers to identify that they should treat the user data as ignition.

We do not currently set this value, but should be.

This may cause issues with certain providers that expect ignition to be uploaded to blob storage, we should identify the behaviour of the providers we care about (AWS, Azure, GCP, vSphere) and ensure that they behave well and continue to work with this change. (This may mean upstream changes to only upload large ignitions to the storage/make the storage optional)

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