Webhooks should handle dry run enabled admission requests

[nawazkh]

/kind feature

Describe the solution you'd like
[A clear and concise description of what you want to happen.]

• As of CAPZ v1.17.2, CAPZ uses custom Defaulter and Custom Validator for handling mutating and validating requests.
• The admission requests are not handled by CAPZ, instead the Default, Create, Update and Delete methods are implemented by CAPZ webhooks.
• While this implementation enables CAPZ to maintain just-required methods, CAPZ webhooks cannot differentiate if the admission request was of Type DryRun.
• To be able to understand if the admission request is of type DryRun, CAPZ webhooks should have access to the complete admission request object.
• This issue serves as a reminder to probe this proposal.

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

• Initial stub:
  • 6cc8fbf
  • 685682f

Environment:

• cluster-api-provider-azure version:
• Kubernetes version: (use kubectl version):
• OS (e.g. from /etc/os-release):