Exclude sampling of requests by default in host.json templates

With the fix for https://github.com/Azure/azure-functions-host/issues/4753 in, we now need to update templates to exclude Requests from sampling. We can’t do it globally because it’d be considered a breaking change, so we’ll tackle it in templates.

{
  "version": "2.0",
  "logging": {
    "applicationInsights": {
      "samplingExcludedTypes": "Request"
    }
  }
}

Needs to be done in 3 parts

• Default template init template for core tools
• Default project template for VS (c# precompiled)
• Default host.json on function app creation from portal

[jeffhollan]

I also wonder if in this change we just explicitely add “samplingEnabled”: true so people see it and can easily toggle off as is a constant source of support tickets

[jeffhollan]

Ah my heart is broken. I was hoping we’d modify to

{
  "version": "2.0",
  "logging": {
    "applicationInsights": {
      "samplingExcludedTypes": "Request",
      "samplingSettings": {
          "isEnabled": true
       }
    }
  }
}

So folks know how to easily toggle this off. But looks like PRs are already in to not include. Can keep an eye out if we should make that additional change so this is more easily discovered by users. @kulkarnisonia16 I would be convinced we should add my “isEnabled” explicit on (which is already default today, it’s just making it more apparent) if we still see a ton of support cases related to samples.