azurerm_traffic_manager_external_endpoint - revert priority back to O+C since API increments the default value

[stephybun]

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Description

• Removed default and set priority back to O+C
• Added a test case to ensure we catch any regression around expected behaviour of the priority field

Testing

Change Log

Below please provide what should go into the changelog (if anything) conforming to the Changelog Format documented here.

• azurerm_traffic_manager_external_endpoint - the value for priority will be dynamically assigned by the API [GH-00000]
• azurerm_traffic_manager_azure_endpoint - the value for priority will be dynamically assigned by the API [GH-00000]

This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Related Issue(s)

Fixes #27275

Note

If this PR changes meaningfully during the course of review please update the title and description as required.

[katbyte]

LGTM 🖥️

[github-actions]

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