azurerm_key_vault_secret: fix empty check for expiration in CustomizeDiff

[wuxu92]

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Description

If the expiraion is dynamic value, it will always be empty in plan stage, This PR is to fix this issue in CustomizeDiff.

Testing

• My submission includes Test coverage as described in the Contribution Guide and the tests pass. (if this is not possible for any reason, please include details of why you did or could not add test coverage)

Because this is for a forceNew logic and currently AccTest cannot cover the case. So I only add a test to update the expiration field.

--- PASS: TestAccKeyVaultSecret_updateExpiration (1204.60s)
PASS

Change Log

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

• azurerm_key_vault_secret - fix CosmizeDiff of expiration_date [azurerm_key_vault_secret forces replacement if expiration_date is not known until apply #28914]

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 #28914