HCP Vault Dedicated - updating AWS and Azure feature parity.

[anurag925]

Description: Updates the HCP Vault Dedicated documentation to reflect that Azure now supports 30-day snapshot retention after cluster deletion.
Changes Made: Removed snapshot retention from the Azure exceptions list since this feature is now supported on Azure.
Impact: Keeps the docs accurate so users aren't misled that snapshot retention is unsupported on Azure when it is actually available and supported.

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[hashicorp-cla-app]

Thank you for your submission! We require that all contributors sign our Contributor License Agreement ("CLA") before we can accept the contribution. Read and sign the agreement

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[jonathanfrappier]

You can delete the changelog updates, we don't publish changes for docs. I will approve this PR after the code freeze lifts on 1/5/26

Please also sign the CLA

[harinimhc]

LGTM, thanks for raising this @anurag925

[jonathanfrappier]

@anurag925 please sign the CLA so I can merge this on 1/5. Feel free to DM me with questions.