azurerm_batch_pool - fix accessing azure_blob_file_system with user_identity assigned.

[liuwuliuyun]

Fixes #20503
Add TestAccBatchPool_mountConfigurationAzureBlobFileSystemWithUserAssignedIdentity

[liuwuliuyun]

I will provide test evidence after teamcity test run complete.

[liuwuliuyun]

[stephybun]

Thanks for this @liuwuliuyun but we have some test failures

------- Stdout: -------
=== RUN   TestAccBatchPool_validateResourceFileWithIdentityReference
=== PAUSE TestAccBatchPool_validateResourceFileWithIdentityReference
=== CONT  TestAccBatchPool_validateResourceFileWithIdentityReference
testcase.go:110: Step 1/1 error: Check failed: Check 1/1 error: building client: building test client: building account: could not acquire access token to parse claims: clientCredentialsToken: cannot request token: Post "https://login.microsoftonline.com/*******/oauth2/v2.0/token": read tcp 192.168.22.243:57134->20.190.154.18:443: read: connection reset by peer
--- FAIL: TestAccBatchPool_validateResourceFileWithIdentityReference (582.89s)
FAIL

------- Stdout: -------
=== RUN   TestAccBatchPool_startTask_userIdentity
=== PAUSE TestAccBatchPool_startTask_userIdentity
=== CONT  TestAccBatchPool_startTask_userIdentity
testcase.go:110: Step 1/2 error: Error running post-apply refresh: exit status 1
Error: building account: could not acquire access token to parse claims: clientCredentialsToken: cannot request token: Post "https://login.microsoftonline.com/*******/oauth2/v2.0/token": read tcp 192.168.22.243:57242->20.190.154.18:443: read: connection reset by peer
with provider["registry.terraform.io/hashicorp/azurerm"],
on terraform_plugin_test.tf line 13, in provider "azurerm":
13: provider "azurerm" {
--- FAIL: TestAccBatchPool_startTask_userIdentity (696.32s)
FAIL

[liuwuliuyun]

Thanks @stephybun for the review, I just rerun the tests and it looks fine. From the error message, I think it could be a temp network problem.

[stephybun]

Thanks @liuwuliuyun LGTM 🍜

[github-actions]

This functionality has been released in v3.45.0 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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