azurerm_key_vault_secret: remove expiration triage recreate

[wuxu92]

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Description

As describe in issue: #28355 (comment) . The expiration date cannot be removed once set. So this PR is to add the forceNew logic for it.

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
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Terraform will perform the following actions:

  # azurerm_key_vault_secret.test must be replaced
-/+ resource "azurerm_key_vault_secret" "test" {
      - expiration_date         = "2026-01-01T01:02:03Z" -> null # forces replacement

Change Log

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

• azurerm_key_vault_secret - ForceNew when removing expiration_date [azurerm_key_vault_secret can't remove expiration_date #28355]

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 #28355

Note

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