Update to use fully resolved paths for babel plugins

[jaridmargolin]

Babel will resolve plugins relative to the cwd (this may be a slight simplification). This usually works as expected, however, I have stumbled on an edge case when using a monorepo structure with abstracted build configuration.

/packages
  /shared-build
    /node_modules
      + react-svg-loader
      + babel-plugin-syntax-jsx
      + babel-plugin-transform-object-rest-spread
  /app
    /node_modules
      + shared-build // symlink

In this case, babel is unable to resolve the plugins which live within the node_modules directory of the symlinked package, shared-build.

While slightly more verbose, we can bypass this problem by utilizing the full paths to the plugins that are installed relative to this package.

[jaridmargolin]

Tests passed locally.

Quickly reading trace on the failing CI, and the error doesn't appear tied to this particular PR.

[jaridmargolin]

Appreciate the quick merge 🙌
Would be hugely helpful if you could publish the updates as well.

Thank you!