remove deprecated @babel/polyfill

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https://babeljs.io/docs/en/babel-polyfill

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seems to exist an issue within jest after removing the polyfill hmmm

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Seems like babel or jest is not doing something right.

With @babel/plugin-transform-runtime doing corejs: 3

console.log client/services/api.test.js:26 Map {}

should be:

Map { 'content-type' => 'application/json' }

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To be honest, afaik @maddrag0n @thiemok , @babel/plugin-transform-runtime was to reduce codesize right? literally 0 difference with it enabled/disabled... do we still need it in this point in time?

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So apparently there is a LOT of back and forth due to this change, and the future is unknown.

Will keep an eye on this: babel/babel#10008 and close this issue/PR for now.