Block contextual menus hidden by sidebar

Problem/Motivation

When editing layout builder page, if the right side bar is open it covers the block contextual menus (configure, move, remove block). So you have to close the sidebar to be able to edit/delete blocks.

Steps to reproduce

1. Go to a layout builder page with blocks on it
2. Have sidebar open
3. Try to hover over blocks to access contextual menus
4. They are positioned under the sidebar menu and can't be accessed

Proposed resolution

We added this css to our site to fix this. It uses the gin css variables to adjust block contextual menus

[data-meta-sidebar="open"] .layout-builder-block .contextual {
    right: var(--gin-sidebar-width);
}

Remaining tasks

User interface changes

API changes

Data model changes