calling_web_hook could be empty for azurerm_bot_channel_ms_teams

[njuCZ]

fix #5450

• when callingWebHook is empty, make the field be nil. In this way, the backend service will not validate this field

After fix this bug, I encountered another bug:
calling_web_hook could not be updated to empty because the update is a patch rest api, It will omit the empty parameter, the field calling_web_hook will remain the last value.
I have submitted an issue in the rest-api-spec:
Azure/azure-rest-api-specs#9809

to avoid diff in terraform, I added comuted: true

[tombuildsstuff]

LGTM 👍

[tombuildsstuff]

Test passes:

[ghost]

This has been released in version 2.14.0 of the provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading. As an example:

provider "azurerm" {
    version = "~> 2.14.0"
}
# ... other configuration ...

[ghost]

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