r\azurerm_cosmosdb_account Fix #14439 and #14630 by setting default value to default_identity_type when API return a nil.

[lonegunmanb]

Terraform should instead be defaulting this implied default value in the Read function where this isn't returned from the API

As @tombuildsstuff suggested in #14439 , this patch set a default value to default_identity_type when API return nil.

[katbyte]

Thanks @lonegunmanb - LGTM 🚀

[github-actions]

This functionality has been released in v2.90.0 of the Terraform Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

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[github-actions]

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