findBreakingChanges tests: use buildSchema when possible (#1406)
* test(findBreakingChanges): use buildSchema when possible
Instead of generating the schema by using the Type constructors,
use buildSchema with the correct SDL for each test.
* fix(prettier): run prettier against findBreakingChanges-test.js
* test(findBreakingChanges): reorder types on SDL to make them more readable
* long-lines of args are one-arg-per-line