azurerm_lb: Support for adding/replacing frontend_ip_configuration with availability_zone

[aristosvo]

Fixes #13017

Acceptance Tests:

❯ make acctests SERVICE='loadbalancer' TESTARGS='-run=TestAccAzureRMLoadBalancer_updatefrontEndConfigsWithZone'
==> 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/loadbalancer -run=TestAccAzureRMLoadBalancer_updatefrontEndConfigsWithZone -timeout 180m -ldflags="-X=github.com/hashicorp/terraform-provider-azurerm/version.ProviderVersion=acc"
=== RUN   TestAccAzureRMLoadBalancer_updatefrontEndConfigsWithZone
=== PAUSE TestAccAzureRMLoadBalancer_updatefrontEndConfigsWithZone
=== CONT  TestAccAzureRMLoadBalancer_updatefrontEndConfigsWithZone
--- PASS: TestAccAzureRMLoadBalancer_updatefrontEndConfigsWithZone (539.04s)
PASS
ok      github.com/hashicorp/terraform-provider-azurerm/internal/services/loadbalancer  541.863s

[katbyte]

Thanks @aristosvo - LGTM 💯

[github-actions]

This functionality has been released in v2.77.0 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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