babel ignore is not possible to use in a babel.config.json

[collinc2343]

I have created a PR for addressing an issue with esbuild. Currently when setting LNG_BUNDLER=esbuild and trying to ignore the babel transpile process on certain folders the ignore setting does not work. This fixes that and allows a developer to use ignore babel transpile settings.

We need this because we are incorporating a new video player, the Sky UK Core Video Player. It has issues with rollup, so we are getting it working with esbuild. I have tested this change locally and it allows us to progress with development.

#176