Remove query context leftovers

[ntsekouras]

Initially there were some exploration on different handling of Query and QueryLoop blocks that would aim to inherit the global query from the URL. These leftovers should be removed.

Trac ticket: https://core.trac.wordpress.org/ticket/53250

Initially there were some exploration on different handling of Query and QueryLoop blocks that would aim to inherit the global query from the URL. This PR removes these leftovers.

This makes sense to me, the query block has never been part of Core.

[youknowriad]

In 50950:

Block Editor: Removed useless block editor render context value.

The "query" context value was meant to be used by the Query block.
But the block has been refactored to avoid relying on context for this.

Props ntsekouras.
Fixes #53250.

This is now committed.