add test for azurerm_firewall.sku_tier

[shu-ying789]

[katbyte]

we have some test failures:

------- Stdout: -------
=== RUN   TestAccFirewallApplicationRuleCollection_noSource
=== PAUSE TestAccFirewallApplicationRuleCollection_noSource
=== CONT  TestAccFirewallApplicationRuleCollection_noSource
    testing_new.go:70: Error running post-test destroy, there may be dangling resources: exit status 1
        
        Error: deleting Azure Firewall Firewall: (Azure Firewall Name "acctestfirewall220112055842432854" / Resource Group "acctestRG-fw-220112055842432854") : network.AzureFirewallsClient#Delete: Failure sending request: StatusCode=415 -- Original Error: Code="UnsupportedMediaType" Message="The content media type '<null>' is not supported. Only 'application/json' is supported."
        
--- FAIL: TestAccFirewallApplicationRuleCollection_noSource (305.85s)
FAIL

[tombuildsstuff]

The Firewall Delete API issue is being tracked in #14966 and I believe is an upstream regression, fwiw

[tombuildsstuff]

LGTM 👍 - the test failures are unrelated to this

dismissing since the API failure is unrelated

[github-actions]

This functionality has been released in v2.93.0 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]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active contributions.
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