[feat]: pass data from webhook to sourceNodes function

[DSchau]

Summary

Gatsby Preview invokes sourceNodes kinda blindly from the webhook.

To make authoring some source plugins easier, we could directly pass the webhook data from the CMS -> Gatsby Preview -> Gatsby, which oftentimes contains the incremental data that is needed to refresh Gatsby Preview content at the plugin level.

Basic example

We should pass webhookData that is the req.body (as JSON) from the POST invocation. This will contain the entire payload from the webhook request from the CMS.

Motivation

This unblocks even more source plugins from being able to refresh content in a Gatsby Preview environment, presuming they pass the differential data to the webhook (many of which do, notably CosmicJS).

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