Add constants for CAPZ Kind names

[CecileRobertMichon]

/kind cleanup

What needs cleanup:
[A clear and concise description of what needs to be cleaned up.]

There are a bunch of hardcoded strings in the codebase for the CRD Kinds ("AzureCluster", "AzureCluster", "AzureMachinePool", "AzureManagedCluster", "AzureManagedControlPlane", "AzureClusterIdentity", etc.). We should add constants for these strings and reuse them throughout the codebase instead of hardcoding them in several places.

Describe the solution you'd like
[Description of how you would like the cleanup to be done.]

Files to change: 2

• File 1
  • Specific lines to cleanup
• File 2
  • Specific lines to cleanup

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

[CecileRobertMichon]

/good-first-issue

[k8s-ci-robot]

@CecileRobertMichon:
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[SD-13]

Hi @CecileRobertMichon Can I work on this issue?

[CecileRobertMichon]

@SD-13 yes please assign yourself to the issue by commenting "/assign"

[SD-13]

/assign

[SD-13]

Hey @CecileRobertMichon I am not sure what would be the correct location to add the constants. Should we add them in api/v1beta1/consts.go?