Use @justfixnyc/geosearch-requester

[toolness]

This is an attempt to use @justfixnyc/geosearch-requester instead of geo-autocomplete-base.tsx.

The tricky bit here is that @justfixnyc-scoped packages contain untranspiled ES6 code, so we need to make sure it all gets transpiled.

This mostly went OK because Gatsby always transpiles node_modules during production (see gatsbyjs/gatsby#14111). However, it seems transpilation to ES5 is not occurring during development, because loading the site in IE11 during development results in a syntax error for an arrow function in @justfixnyc/geosearch-requester--but building the site for production using yarn build and then viewing it in IE11 works fine. I'm not a fan of this, but I'm not sure if there's any way to easily fix it.

Jest support had to be added using its transformIgnorePatterns configuration option.

Additionally, I manually imported whatwg-fetch because its polyfill is needed for IE11.

[sraby]

thank you @toolness!

[sraby]

And arggg yes I noticed the odd error when trying to use Browserstack with my localhost... the good news is that the DDO dropdown is now indeed working on IE and we are able to test any pending changes with our Netlify preview link.