Allow social link block movers based on layout orientation

[richtabor]

Description

Now that the social links block supports layout orientation — which allows for horizontal and vertical layouts — the child blocks' block movers need to adapt based on that orientation as well.

Currently, when you select a social link the block movers are always vertical arrows. The "up" arrow moves the block to the left, and the "down" arrow moves the block to the right.

We had this working properly previously, though I'm thinking the regression occurred with the introduction of layout controls for the parent block.

Step-by-step reproduction instructions

1. Add a Social Links block.
2. Add at least two links within the block.
3. Select a link, see up and down movers that move it left and right.

Screenshots, screen recording, code snippet

Current (vertical block movers, although they move the social links left or right):

Suggested (movers based on layout orientation):

CleanShot.2023-02-24.at.18.50.06.mp4

Environment info

• WordPress Beta 3
• Gutenberg trunk

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes