Add / Hide All Featured Images

[ronchambers]

This general use CLI will add postmeta newspack_featured_image_position = 'hidden' to all posts that have a featured image.

Usage: wp newspack-content-migrator hide-all-featured-images

Output log: hide_all_featured_images.log

Note:

• There is a similar existing command (newspack-content-migrator hide-featured-images) in file (src/Command/General/PostsMigrator.php). After reviewing that command it would have been more work to refactor it for this new use case. The existing command requires a list of post ids and/or a category id. Our use case doesn't call for a list of post ids nor category id. Additionally the existing command needs to be called multiple times in order to process all rows (or use a very high posts-per-batch count that could take up too much processing power). The new command in this PR makes use of throttled_posts_loop to by pass this concern.

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• [x] (only for this new code) confirmed that PHPCS has been run

[ronchambers]

@iuravic - I moved the function to the other file, ran phpcs (for my code), and fully tested.