Writing the property default_hostname back to state for function apps

[xiaxyi]

fixing issue:#16263

[reifnir]

Hi @xiaxyi , it looks like there are now conflicts with this MR due to recent merges.

[reifnir]

I'm happy to make the changes to fix this, but don't want to steal your thunder if you want to take care of it

[katbyte]

Thanks @xiaxyi - LGTM once the merge conflicts are fixed (and theres a test failure that would be good to fix up too)

------- Stdout: -------
=== RUN   TestAccWindowsFunctionApp_addAppSettings
=== PAUSE TestAccWindowsFunctionApp_addAppSettings
=== CONT  TestAccWindowsFunctionApp_addAppSettings
    testcase.go:110: Step 3/6 error: After applying this test step, the plan was not empty.
        stdout:
        
        
        Terraform used the selected providers to generate the following execution
        plan. Resource actions are indicated with the following symbols:
          ~ update in-place
        
        Terraform will perform the following actions:
        
          # azurerm_windows_function_app.test will be updated in-place
          ~ resource "azurerm_windows_function_app" "test" {
                id                                = "/subscriptions/*******/resourceGroups/acctestRG-LFA-220706171542149292/providers/Microsoft.Web/sites/acctest-WFA-220706171542149292"
                name                              = "acctest-WFA-220706171542149292"
                tags                              = {}
                # (25 unchanged attributes hidden)
        
        
              ~ site_config {
                    # (23 unchanged attributes hidden)
        
                  + application_stack {
                      + node_version                = "~14"
                      + use_dotnet_isolated_runtime = false
                    }
                }
                # (1 unchanged block hidden)
            }
        
        Plan: 0 to add, 1 to change, 0 to destroy.
--- FAIL: TestAccWindowsFunctionApp_addAppSettings (378.66s)
FAIL

[xiaxyi]

Thanks @katbyte , the test failure should have nothing to do with the property in this pr. I will check the test failures and submit a pr for the fix once I find the cause.

[xiaxyi]

I'm happy to make the changes to fix this, but don't want to steal your thunder if you want to take care of it

Thanks for offering the help! I resolved the conflicts. :)

[github-actions]

This functionality has been released in v3.14.0 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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