Product Query: custom implementation of inherit query from template

[sunyatasattva]

As we want to minimize changes we do in Gutenberg, we need to override the setting “Inherit Query from Template” in our block variation because, in the current implementation of the PostTemplate, Gutenberg uses the global $wp_query and our current proposal would not be applicable without a big refactor.

Instead, our Product Query block will always use the filter we introduce above, and we'll handle the global $wp_query on our side.

We need to implement three functionalities in the long term:

1. Adding an option equivalent to “Inherit Query from Template” (perhaps even visually identical) to make the Product Query compatible with FSE templates.
2. Merge more specific queries into the global query
3. Merge query parameters from the URL into the global query to allow compatibility with filters (Product Query: Generate the custom query by filters applied #6791)

Depends on: sunyatasattva/gutenberg#2

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