Pipelines should emit a packages_published_total metric

We should start emitting metrics from our pipelines to track the number of packages we publish.

The pipelines should emit a metric in the [logmetric format](https://dev.azure.com/azure-sdk/internal/_wiki/wikis/internal.wiki/982/Pipeline-log-metrics?anchor=emitting-metrics):

```
logmetric: { "name": "packages_published_total", "value": 1, "timestamp": "2023-06-21T19:03:27Z", "labels": { "format": "npm", ... } }
```

The metric name should be the same for all languages and package types (nuget, npm, etc...). The labels should differentiate the packages by:
- **language** : "dotnet"
- **feed** : "azure-sdk/public/azure-sdk-for-net"
- **format**: "nuget"
- **service**: "storage"
- **package_name**: "Azure.Storage.Blobs.ChangeFeed"
- **version**: "12.0.0-preview.35"
- **release_type**: "beta" ("official", "alpha", etc)

With good labels, this will allow us to locate releases of individual packages, or aggregate the packages emitted by language, service or feed:

**official release count by calendar month**
``` kusto
Metrics
| where Timestamp >= startofmonth(ago(365d))
| where Name == "packages_published_total"
| where Labels.release_type == "official"
| summarize sum(Value) by startofmonth(Timestamp)
```

**find the build id that released a specific version**
``` kusto
Metrics
| where Timestamp >= ago(365d)
| where Name == "packages_published_total"
| where Labels.release_type == "official"
| where Labels.package_name == "Azure.Storage.Blobs.ChangeFeed"
| where Labels.version == "12.0.0"
| project Timestamp, BuildId, LogId, LineNumber
```

Start by locating the package-publishing pipelines and the Azure DevOps logmetric format referenced in the issue. Add the shared packages_published_total metric across the relevant language and package-type pipelines, with the listed labels, and verify that published packages produce the expected release records.

Written by the indexing model from the issue text.