fix(js_formatter): Allow JSX expressions to nestle on arrow chains #1033
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Summary
Fixes #1024.
JSX Expressions are similar to objects, arrows, and function expressions for arrow chain bodies, where they can render their initial tag on the same line as the end of the arrow chain signatures. This was already supported for single arrow expressions, but the logic didn't carry over into the Chain layout.
This also addresses a big diff in a Prettier test about arrow chains within jsx expressions, and adds the same logic for inserting a soft line break at the end of the expression, again matching the Single layout that already existed.
Test Plan
Prettier diff snapshot is deleted because they now match. Also added a spec test to ensure it continues working as expected.