azurerm_key_vault_key - expiration_date only recreates the resource when it is removed from the config file

[mbfrahry]

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Description

Key Vault Key expiration dates can be updated but not removed and this PR adds that functionality into the provider.

--- PASS: TestAccKeyVaultKey_updateExpirationDate (1264.03s)

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
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Changes to existing Resource / Data Source

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Change Log

Below please provide what should go into the changelog (if anything) conforming to the Changelog Format documented here.

• azurerm_key_vault_key - expiration_date only recreates the resource when it is removed from the config file [GH-00000]

This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Related Issue(s)

Fixes #0000

Note

If this PR changes meaningfully during the course of review please update the title and description as required.

[stephybun]

Thanks @mbfrahry LGTM ⚡