#3522016 Add side menu

Jesse Bakerrequested to merge
issue/experience_builder-3522016:design-refresh-ga-sidemenu into 0.x

Closes #3522016 - adds the new sideMenu component.

See comments - this MR disables the drag-and-drop Cypress test. A follow up to re-write in Playwright has been created.

This is branched from !961 (merged) so should be merged after that! !961 (merged) is merged!

Edited by Jesse Baker

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