### Description

To provide a full process polyfill:

* We need to remove the process hack
* We need to make the ProcessEnvAsset a Source Asset instead of a Module
Asset (we want to allow injecting the process polyfill.
* We need to pass source assets instead of module assets as
runtime_entries and process them with the AssetContext

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Co-authored-by: Justin Ridgewell <justin@ridgewell.name>