fix(babel-preset-gatsby): Add babel-plugin-dynamic-import-node for tests #15657
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Node 8 (which we still support) doesn't understand dynamic imports. While it's okay to keep these untranspiled (like in
gatsby-image/withIEPolyfill) because webpack will handle them anyway, this breaks tests run on Node 8 (https://circleci.com/gh/gatsbyjs/gatsby/169116?utm_campaign=vcs-integration-link&utm_medium=referral&utm_source=github-build-link).To fix this, we need to conditionally transpile these to deferred requires for Node in test environments. This PR does that for this monorepo's jest config and for
babel-preset-gatsbywhich we recommend in https://www.gatsbyjs.org/docs/unit-testing/