azurerm_api_management_api_diagnostic fix support for identifier azuremonitor

[smokedlinq]

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Description

The diagnostic settings for identifier type azuremonitor does not support OperationNameFormat. This is a similar code change to what is in the azurerm_api_management_diagnostic resource to only include the value if the identifier is applicationinsights

Error from ARM service:

{
  "error": {
    "code": "ValidationError",
    "message": "One or more fields contain incorrect values:",
    "details": [
      {
        "code": "ValidationError",
        "target": "operationNameFormat",
        "message": "Property 'OperationNameFormat' is only supported for Application Insights diagnostics."
      }
    ]
  }
}

PR Checklist

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Changes to existing Resource / Data Source

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Change Log

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

• azurerm_api_management_api_diagnostic - fix for azuremonitor support

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 #25781
Fixes #17098

Note

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

[katbyte]

Thanks @smokedlinq - LGTM 🔬

[github-actions]

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