azurerm_web_pubsub_hub - fix failed acc tests

[xiaxyi]

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Description

There is a url template validation was added to the api, specifically, the api will validate the {} now, if we use {} in the urlTemplate property, we will need to follow below pattern strictly:

PR Checklist

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Change Log

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• azurerm_web_pubsub_hub - fix url_template under event_handler property [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 #0000

Note

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