azurerm_windows_web_app,azurerm_windows_web_app_slot, azurerm_windows_function_app, azurerm_windows_function_app_slot, azurerm_linux_web_app,azurerm_linux_web_app_slot, azurerm_linux_function_app, azurerm_linux_function_app_slot - fix ip_restriction,scm_ip_restriction block cannot be removed issue

[xiaxyi]

fix #18793
fix #18664
fix #20331

--- PASS: TestAccWindowsWebApp_withIPRestrictions (354.81s)
--- PASS: TestAccWindowsWebApp_withIPRestrictionsUpdate (821.52s)
PASS
ok      github.com/hashicorp/terraform-provider-azurerm/internal/services/appservice    822.239s

There is a default value for ip_restriction, we need to deal with it when user removes the block, otherwise, the set value cannot be override by null.

[jackofallops]

Thanks for this @xiaxyi - I'm going to close this due to an underlying fix being present in 20987.

Thanks again

[github-actions]

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