SKU parameter for azurerm_firewall_policy

[AliAllomani]

Fixes #9886

$ make testacc TEST='./azurerm/internal/services/firewall' TESTARGS='-run=TestAccFirewallPolicy_basicPremium' TESTTIMEOUT='60m'
==> 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 ./azurerm/internal/services/firewall -v -run=TestAccFirewallPolicy_basicPremium -timeout 60m -ldflags="-X=github.com/terraform-providers/terraform-provider-azurerm/version.ProviderVersion=acc"
=== RUN   TestAccFirewallPolicy_basicPremium
=== PAUSE TestAccFirewallPolicy_basicPremium
=== CONT  TestAccFirewallPolicy_basicPremium
--- PASS: TestAccFirewallPolicy_basicPremium (116.12s)
PASS
ok      github.com/terraform-providers/terraform-provider-azurerm/azurerm/internal/services/firewall  118.610s

$ make testacc TEST='./azurerm/internal/services/firewall' TESTARGS='-run=TestAccFirewallPolicy_update' TESTTIMEOUT='60m'==> 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 ./azurerm/internal/services/firewall -v -run=TestAccFirewallPolicy_update -timeout 60m -ldflags="-X=github.com/terraform-providers/terraform-provider-azurerm/version.ProviderVersion=acc"
=== RUN   TestAccFirewallPolicy_update
=== PAUSE TestAccFirewallPolicy_update
=== CONT  TestAccFirewallPolicy_update
--- PASS: TestAccFirewallPolicy_update (219.52s)
PASS
ok      github.com/terraform-providers/terraform-provider-azurerm/azurerm/internal/services/firewall  222.069s

[katbyte]

Thanks for the PR @caius - this looks good aside from that we shouldn't be ignoring case, for the SKU unless there is a reason to - i'm going to flip that and then run the tests.

Other then that LGTM 👍

[ghost]

This has been released in version 2.45.0 of the provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading. As an example:

provider "azurerm" {
    version = "~> 2.45.0"
}
# ... other configuration ...

[ghost]

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