azurerm_batch_pool: Support for identity

[aristosvo]

Fixes #13758

Acceptance Tests

=== RUN   TestAccBatchPool_identity
=== PAUSE TestAccBatchPool_identity
=== CONT  TestAccBatchPool_identity
--- PASS: TestAccBatchPool_identity (642.47s)

=== RUN   TestAccBatchPool_identityUpdate
=== PAUSE TestAccBatchPool_identityUpdate
=== CONT  TestAccBatchPool_identityUpdate
--- PASS: TestAccBatchPool_identityUpdate (734.54s)

[haflidif]

Is it possible to get this merged in next release 2.82.0 ? 👍 would be awesome, but I understand if it needs more QA
Thank you @aristosvo to pick this up so soon 🖖

[katbyte]

Thanks @aristosvo - LGTM 🌿

[github-actions]

This functionality has been released in v2.82.0 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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