`AppendToBody` for toolbar to pass to its menu

[pilat-martin]

Frontend Pull Request Description

Toolbar menu is forced to be appended to the toolbar, but its position is computed on the assumption that the toolbar is not placed under a position: relative parent. In short, the menu appear in wrong place. Appending it to the body fixes that.

Checklist

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my code
• [ ] I have updated change log
• [x] I have been following Definition of done
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] My changes generate no new lint warnings
• [x] New and existing unit tests pass locally and on CI with my changes
• [x] Any dependent changes have been merged and published in downstream modules