Permit trashing patterns with draft status in post editor

[ramonopoly]

First reported in ​https://github.com/WordPress/gutenberg/issues/53367

Since 6.3 it's not possible to trash wp_block custom post types that have a post_status of draft.

The wp_block post type has delete_published_posts in the capabilities array only.

Step-by-step reproduction instructions:

1. Add a pattern in the post editor (wp-admin/edit.php?post_type=wp_block)
2. Save it in draft status
3. Go back to the list table
4. Try to trash the pattern (the row action will not be there)

Syncing changes from:

• ​https://github.com/WordPress/gutenberg/pull/53405

Adds delete_posts to the wp_block (patterns) capabilities.

Required to allow users to delete draft posts from wp-admin/edit.php?post_type=wp_block

See Gutenberg issue:

• ​https://github.com/WordPress/gutenberg/issues/53367

Trac ticket: https://core.trac.wordpress.org/ticket/59041

[ramonopoly]

Does 59041.diff do anything different to the already-attached ​https://github.com/WordPress/wordpress-develop/pull/4987?

[dhruvishah2203]

I think it's a same @ramonopoly

[audrasjb]

WP 6.3.1 is going to be released in the next few days, so let's move this ticket to 6.3.2 to give it more time to be committed and backported.

[isabel_brison]

In 56577:

Post Types: allow trashing draft patterns.

Adds delete_posts to capabilities for the wp_block post type.

Props ramonopoly, johnbillion, dhruvishah2203, audrasjb.
Fixes #59041.

Committed in r56577.

[isabel_brison]

Reopening this ticket so it can be backported to 6.3.

[joemcgill]

Thanks @isabel_brison. The change in r56577 looks good to me.

[audrasjb]

In 56777:

Post Types: allow trashing draft patterns.

Adds delete_posts to capabilities for the wp_block post type.

Props ramonopoly, johnbillion, dhruvishah2203, audrasjb, isabel_brison, joemcgill.
Merges [56577] to the 6.3 branch.
Fixes #59041.