fix: dont overload NodeWithEditorBlocks.flat

[justlevine]

What

This PR removes the unnecessary flat arg definition from NodeWith{$Post_Type}EditorBlocks, instead relying on the arg definition set by the parent NodeWithEditorBlocks.

Why

The real reason is that there is no difference between the parent and child implementations, so there's no reason to overload.

The superficial reason is that it works around a WPGraphQL core regression wp-graphql/wp-graphql#3152 which:

• closes Interface field argument error in GraphQL IDE after update to WPGraphQL 1.26 #240
• fixes the missing argument description error in graphql-schema-linter.

Screenshots

Look ma no extension.debug messages

[changeset-bot]

🦋 Changeset detected

Latest commit: 6de0fde

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@wpengine/wp-graphql-content-blocks	Patch

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[theodesp]

@justlevine we might need to resolve the conflicts before merging thanks!

[justlevine]

@theodesp done in 6de0fde.

Seems the conflict was just whitespace...