List block v2: Fix impossible to outdent multiple list items.

[jorgefilipecosta]

Fixes: #39893

This PR implements the functionality to outdent multiple list items on list block v2.

Notes

1. You need to have enabled the experimental version 2 of list in Gutenberg experiments.

Testing Instructions

1. Insert a new list block with any nested lists
2. Test any outdenting possible with different combinations:
   1. single list item(with nested lists or not)
   2. multiple list items(with nested lists or not)
   3. any list item/items that are going to be merged in a list item with multiple lists
3. Selection should be preserved for single list items and multi-selection for multiple selected list items

[github-actions]

Size Change: +88 B (0%)

Total Size: 1.24 MB

Filename	Size	Change
build/block-library/index.min.js	181 kB	+88 B (0%)

ℹ️ View Unchanged

Filename	Size
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build/annotations/index.min.js	2.73 kB
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