azurerm_batch_account - add supports for identity

[magodo]

Fixes #8532

Test Result

💢 TF_ACC=1 go test -timeout=3h -v ./internal/services/batch -run='TestAccBatchAccount_identity'
=== RUN   TestAccBatchAccount_identity
=== PAUSE TestAccBatchAccount_identity
=== CONT  TestAccBatchAccount_identity
--- PASS: TestAccBatchAccount_identity (276.74s)
PASS
ok      github.com/hashicorp/terraform-provider-azurerm/internal/services/batch 276.890s

[aristosvo]

Last one: probably also required on type = "SystemAssigned, UserAssigned"?

Suggested change

	* `identity_ids` - (Optional) Specifies a list of user assigned identity ids. Required if `type` is `UserAssigned`.
	* `identity_ids` - (Optional) Specifies a list of user assigned identity ids. Required if `type` is `UserAssigned` or `SystemAssigned, UserAssigned`.

[magodo]

@aristosvo In fact the batch account doesn't support the SystemAssigned, UserAssigned type. That's why I didn't mention that in the document of the type property.

[katbyte]

Thanks @magodo - LGTM 🚀

[github-actions]

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