Update hci-registration-azure-prerequisites.md

[schmittnieto]

To register the cluster, Key Vault is required, and since it is not registered by default in the subscription, I add it at the end line.

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[v-dirichards]

@alkohli

Can you review the proposed changes?

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#label:"aq-pr-triaged"
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[Copilot]

Pull request overview

Adds Key Vault to the list of Azure resource providers that must be registered before Azure Local cluster registration, aligning the prerequisites with the Key Vault dependency mentioned in the PR description.

Changes:

• Add Microsoft.KeyVault to the PowerShell Register-AzResourceProvider command list in the Azure prerequisites include.

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