r\purview_account_resource: Deprecate sku_name property

[myc2h6o]

• The sku property of Purview Account can only be updated through a support ticket now, and has been removed from the request body when creating the resource. Since it's no longer managed by api, and the value can only be changed outside terraform, i'm considering removing it. In order to avoid breaking change, I'm updating it from Required to Optional + Deprecated.

• Doc and issue:
  https://docs.microsoft.com/en-us/azure/purview/concept-elastic-data-map#request-capacity
  [API Regression] [Purview] Accounts Sku Capacity is always reset to 1 Azure/azure-rest-api-specs#15675

• Test result:
  $ make acctests SERVICE='purview' TESTARGS='-run=Test' TESTTIMEOUT='60m'
  ==> Checking that code complies with gofmt requirements...
  ==> Checking that Custom Timeouts are used...
  ==> Checking that acceptance test packages are used...
  TF_ACC=1 go test -v ./internal/services/purview -run=Test -timeout 60m -ldflags="-X=github.com/hashicorp/terraform-provider-azurerm/version.ProviderVersion=acc"
  === RUN TestAccPurviewAccount_basic
  === PAUSE TestAccPurviewAccount_basic
  === RUN TestAccPurviewAccount_requiresImport
  === PAUSE TestAccPurviewAccount_requiresImport
  === CONT TestAccPurviewAccount_basic
  === CONT TestAccPurviewAccount_requiresImport
  --- PASS: TestAccPurviewAccount_basic (657.38s)
  --- PASS: TestAccPurviewAccount_requiresImport (683.11s)
  PASS
  ok github.com/hashicorp/terraform-provider-azurerm/internal/services/purview 683.774s

[katbyte]

Thanks @myc2h6o - LGTM 👍

[github-actions]

This functionality has been released in v2.84.0 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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