Use Yarn 2 (#11962)

* chore: use yarn 2

* chore: remove redundant yarn locks

* chore: remove publishEslintPkg

* chore: remove redundant make bootstrap

* Update .yarnrc.yml

Co-authored-by: Kristoffer K. <merceyz@users.noreply.github.com>

* chore: use workspace protocol for eslint packages in the root

Co-Authored-By: merceyz <merceyz@users.noreply.github.com>

* chore: pin caniuse-lite versions

Testcases in packages/babel-preset-env/test/fixtures/debug/browserslists-defaults-not-ie
depends on specific caniuse-lite versions. We pinned the version here
so we don't have to deal with fixture different in e2e-tests
where all deps will be updated and tested.

* chore: resolve yarn install warnings

* chore: update yarn cache path on circle/travis

* chore: add yarn deduplicate plugin

* chore: deduplicate lock files

* chore: move devDependencies to leaf packages

* chore: remove @yarnpkg/plugin-constraints

* chore: remove unused dedupe options

* test: fix unwanted self reference

* chore: remove output-file-sync dependency

* chore: update browserify to 16.5.2

Co-authored-by: Kristoffer K. <merceyz@users.noreply.github.com>

scripts/integration-tests/e2e-create-react-app.sh

@@ -21,13 +21,28 @@ cd tmp/create-react-app || exit
 #                                   TEST                                       #
 #==============================================================================#
 
+# !!! WARNING !!!
+# create-react-app uses the useBuiltIns: true option of @babel/preset-react,
+# removed in Babel 8.0.0. And it does not specify runtime option. The test will break on
+# runtime: "automatic", default of Babel 8.
+# This change replaces useBuiltIns: true with runtime: "classic"
+sed -i 's/useBuiltIns: true/runtime: "classic"/' packages/babel-preset-react-app/create.js
+
+bump_deps="$PWD/../../utils/bump-babel-dependencies.js"
+node "$bump_deps"
+for d in ./packages/*/
+do
+  (cd "$d"; node "$bump_deps")
+done
+
+# Don't use Yarn 2
+export YARN_IGNORE_PATH=1
+
 startLocalRegistry "$PWD"/../../verdaccio-config.yml
 yarn install
-node "$PWD"/../../utils/bump-babel-dependencies.js
-yarn lerna exec -- node "$PWD"/../../utils/bump-babel-dependencies.js
-yarn install
 
 # Test
 CI=true yarn test
 
+unset YARN_IGNORE_PATH
 cleanup