Add linter for naked console.errors

Summary:
`console.error(err)` are hard to identify in the codebase especially
as we often don't have reliable stack trace information.

I've already cleaned up a bunch of them manually by going after the most
high-firing ones; this should make it easier to identify the remaining ones.

Reviewed By: jknoxville

Differential Revision: D27913964

fbshipit-source-id: 0ff6624a0c083829846550b40954945d655b7cf6

desktop/.eslintrc.js

@@ -85,6 +85,7 @@ module.exports = {
     'node/no-extraneous-require': [2, {allowModules: builtInModules}],
     'flipper/no-relative-imports-across-packages': [2],
     'flipper/no-electron-remote-imports': [1],
+    'flipper/no-console-error-without-context': [1],
   },
   settings: {
     'import/resolver': {