azurerm_key_vault: fix enabling "purge_protection_enabledissue" does not work issue

[sinbai]

Fix issue #16289.

When the KV was created with a version prior to v2.42 and the soft_delete_enabled is set to false, setting purge_protection_enabled to true would not work when updating KV with v2.42 or later of terraform provider. This is because the purge_protection_enabled only works when soft delete is enabled. Since version v2.42 of the Azure Provider and later force the value of soft_delete_enabled to be true, we should set EnableSoftDelete to true in func resourceKeyVaultUpdate when purge_protection_enabled is enabled.

[tombuildsstuff]

LGTM 👍

[github-actions]

This functionality has been released in v3.12.0 of the Terraform Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

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