Key vaults need to be created using Azure defaults and not "purge protection" enabled

[robsmi-msfte]

The AVD blueprint 'Keyvault.json' artifact current creates a key vault with the "purge protection" setting enabled. This is not the Azure default. The problem is that once this key vault is created, purge protection cannot be disabled, and that key vault will be in soft delete state until the retention period expires.

[robsmi-msfte]

Edited the 'keyvault.json' artifact and removed the lines that set "soft delete" and "purge protection" settings. Now the key vault is created using Azure defaults. Also the key vault API versions were updated in the artifact file.