Default meta boxes appear in block editor's options modal

[noisysocks]

Reported by @ocean90 in https://core.trac.wordpress.org/ticket/45112?replyto=28#comment:28.

The classic editor's meta boxes are incorrectly being listed underneath Advanced Panels in the block editor's Options modal.

Steps to reproduce:

1. Create a new post
2. Click on the Show more tools & options (︙) button
3. Select Options

Expected behaviour:

Only the General and Document Panels sections should appear.

Actual behaviour:

The Advanced Panels section appears with Publish, Categories, Tags, etc.

Screenshot:

[noisysocks]

I've patched the_block_editor_meta_boxes() to ignore meta boxes that are there for backwards compatibility or that are incompatible with the block editor.

[pento]

In 43856:

Block Editor: Don't show back compat or incompatible meta boxes in Options.

Meta boxes that exist for back compat, or that are incompatible with the block editor aren't displayed, so they don't need an option to display or hide them in the Options dialog.

Props noisysocks.
Fixes #45249.

[SergeyBiryukov]

Reopening for trunk.

[jeremyfelt]

In 44222:

Block Editor: Don't show back compat or incompatible meta boxes in Options.

Meta boxes that exist for back compat, or that are incompatible with the block editor aren't displayed, so they don't need an option to display or hide them in the Options dialog.

Merges [43856] from the 5.0 branch to trunk.

Props noisysocks.
Fixes #45249.