wp-includes/blocks shouldn't be excluded from coding standards

[johnbillion]

The wp-incudes/blocks directory is excluded from coding standards. This is presumably because the files are imported from Gutenberg, but there's no reason these files shouldn't adhere to core's coding standards.

Needs some investigation into why the directory is excluded, whether the files need updating in Gutenberg to adhere to core coding standards, and corresponding tickets on the Gutenberg repo as necessary.