primarily improves the code for the tests and removes overlap test components

Pills and React Flow components impl can be shared for consistency.
Schema vs QueryBuilder can provide subclasses.

The cytoscape layouts needed the headless mode to
compute the width and height correctly.
Now the layouts are working with these (computed) options.

Adds cytoscape klay, dagre, elk, fcose, cose-bilkent, cise to the layout library

Was only used for trying nx's publishable library functionalities.

Several (potentially even external) libraries might want
to use our mock data and some utils. I pulled them
out into a lib with a package.json