Prometheus: Use frontend package in Prometheus DS with a feature toggle

[bohandley]

What is this?

This uses @grafana/prometheus frontend package in core Prometheus with the feature toggle usePrometheusFrontendPackage.

Components that directly use the package in module.ts:

• DataSource
• PromQueryEditorByApp
• PromCheatSheet

Component that indirectly uses the package:

• ConfigEditor: This component still requires auth from Azure and SigV4. These will be removed at a future date (to be determined with a migration plan to external Prometheus data sources). In the meantime, we use a Config Editor component that supports these auths and at a deeper level uses components from the @grafana/prometheus package.

*** also updating go.work.sum after talking with @itsmylife

Why do we need this?

This is part of the decoupling and decomposing work of Grafana Prometheus.

Special notes:

There will need to be a note in the change log when this work is GA. Notes to include

• Automatic version detection is disabled
• Default support of labels with match[] over series endpoint (users with old versions of Prometheus will have to update the version and type in the Configuration Page to get support for the series endpoint.

Please check that:

• It works as expected from a user's perspective.
• If this is a pre-GA feature, it is behind a feature toggle.
• The docs are updated, and if this is a notable improvement, it's added to our What's New doc.