Update azurerm_application_gateway priority attribute to confirm its now mandatory

[bubbletroubles]

Fixes #16793

[katbyte]

Thanks @bubbletroubles - LGTM (thou we'll also need to update the property to be required)

[github-actions]

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[bubbletroubles]

Thanks @bubbletroubles - LGTM (thou we'll also need to update the property to be required)

Thanks @katbyte I've submitted #16849 to make the priority required

[github-actions]

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