Block editor admin assets should use asset file version when in debug/local mode

[helgatheviking]

Admin assets defined in block.json are enqueued in the editor with the version property from block.json of if not defined, the version of WordPress. [source](​https://github.com/WordPress/wordpress-develop/blob/455044e6261e64970fb9039dba52ceb47290a634/src/wp-includes/blocks.php#L273)

That's fine for plugin release, but for development it means you can build a block using the [create block script](​https://developer.wordpress.org/block-editor/reference-guides/packages/packages-create-block/), run npm run start and the editor style assets get compiled correctly as you work but the browser keeps showing the cached version stylesheet. Editor scripts however, [pull a version from the index.asset.php](​https://github.com/WordPress/wordpress-develop/blob/455044e6261e64970fb9039dba52ceb47290a634/src/wp-includes/blocks.php#L194) so it's always refreshed on page reload.

I'd love to see the order go something like:

If dev mode (either WP_DEVELOPMENT_MODE or WP_ENVIRONMENT_TYPE constants then use the version of index.asset.php.

If not dev mode, use the version from the block.json file.

Finally, default to the version of WordPress.