Tiled Gallery: Individual images should use the standard block toolbar.

### Impacted plugin

Jetpack

### What

Individual images should use the standard block toolbar.

### How

Images in Tiled Gallery blocks use arrow over the top of the image to control the order. Ideally these images would use a block toolbar to expose the block movers, like all other blocks:

This would also solve this issue: https://github.com/Automattic/jetpack/issues/19417

The issue points to the Jetpack Tiled Gallery block and its individual-image controls; start by locating that block’s editor implementation and its existing block-toolbar or mover handling. Verify the result in the block editor: individual images should expose the standard block toolbar movers instead of the over-image arrows, and check related issue #19417 for context.

Written by the indexing model from the issue text.