Add support for skipping Azure KeyVault Uri Verification

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This PR (attempt 2) introduces support for skipping the Azure Key Vault Uri Verification that was introduced in azure-sdk-for-go/sdk/security/keyvault/[email protected] which sops integrated with v3.8.0. This change introduced issues for those who use Key Vaults that are located behind proxies that leverage CNAMES.

Original MS Blog: https://devblogs.microsoft.com/azure-sdk/guidance-for-applications-using-the-key-vault-libraries/

Previous PR: #1980

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@felixfontein Is there anything I can do to get this moved along as its a major roadblock for me at the moment. Thanks!