Remove absolute path parameter from transformers

Summary:
Up until now, transformers in Metro received the absolute path of a file, the relative path of a file and the projectRoot.

This diff gets rid of the absolute path sent to the worker, since by having the projectRoot and the relative path, the absolute path can be easily calculated.

This has been done to avoid having absolute paths as transform options, since we need to have custom logic to filter them out from the cache key generation, which is dangerous.

Reviewed By: mjesun

Differential Revision: D9195147

fbshipit-source-id: e95c5c29272eec7f1a48af7cede4c6d6b4a8ffb7

jest/preprocessor.js

@@ -49,7 +49,6 @@ module.exports = {
 
     const {ast} = transformer.transform({
       filename: file,
-      localPath: file,
       options: {
         ast: true, // needed for open source (?) https://github.com/facebook/react-native/commit/f8d6b97140cffe8d18b2558f94570c8d1b410d5c#r28647044
         dev: true,