Update babel-eslint and eslint packages

[necolas]

Summary

We need to update our eslint dependencies as they have fallen behind.

This patch updates the main eslint package and adds eslint-config-prettier to silence errors related to formatting, which prettier manages.

Test Plan

yarn lint.

Notes

This diff does not update eslint plugin packages, because adding the following results in yarn lint failing with the attached error message.

diff --git a/package.json b/package.json
index d64d53a6a..a3159d8b4 100644
--- a/package.json
+++ b/package.json
@@ -47,12 +47,13 @@
     "danger": "^9.1.8",
     "error-stack-parser": "^2.0.2",
     "eslint": "^6.8.0",
-    "eslint-config-fbjs": "^1.1.1",
+    "eslint-config-fbjs": "^3.1.1",
     "eslint-plugin-babel": "^5.3.0",
     "eslint-plugin-flowtype": "^2.25.0",
     "eslint-plugin-jest": "^22.15.0",
+    "eslint-plugin-jsx-a11y": "^6.2.3",
     "eslint-plugin-no-for-of-loops": "^1.0.0",
-    "eslint-plugin-react": "^6.7.1",
+    "eslint-plugin-react": "^7.17.0",
     "eslint-plugin-react-internal": "link:./scripts/eslint-rules",
     "fbjs-scripts": "^0.8.3",
     "filesize": "^3.5.6",

export * from './src/ReactIs';
^^^^^^

SyntaxError: Unexpected token export
    at Module._compile (internal/modules/cjs/loader.js:723:23)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
    at Module.load (internal/modules/cjs/loader.js:653:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:593:12)
    at Function.Module._load (internal/modules/cjs/loader.js:585:3)
    at Module.require (internal/modules/cjs/loader.js:692:17)
    at require (internal/modules/cjs/helpers.js:25:18)
    at Object.<anonymous> (/Users/necolas/OpenSource/github/facebook/react/node_modules/prop-types/index.js:9:17)
    at Module._compile (internal/modules/cjs/loader.js:778:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10)
error Command failed with exit code 1.

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[gaearon]

What's up with the commas? Did we change Prettier config, or how does this work?

[sizebot]

No significant bundle size changes to report.

Size changes (experimental)

Generated by 🚫 dangerJS against a4ae345

[sizebot]

No significant bundle size changes to report.

Size changes (stable)

Generated by 🚫 dangerJS against a4ae345

[necolas]

Oh yeah I forgot none of the lint/format commands automatically run on-commit in this repo.

What's up with the commas? Did we change Prettier config, or how does this work?

Running yarn lint produced a lot of errors about missing trailing commas

[gaearon]

Here's what I don't understand. Presumably, yarn prettier would have removed those commas (because Prettier doesn't know about our ESLint config). But why didn't CLI fail? Our CI should fail when yarn prettier produces a change.

[necolas]

IIRC CI did fail over prettier producing changes