Remove setup_artifacts as unnecessary (#38901)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/38901

This step is really necessary or if the folders will be created on the fly.

Changelog:
[Internal] [Changed] - Remove setup_artifacts as unnecessary

Reviewed By: mdvacca

Differential Revision: D48197595

fbshipit-source-id: ed2455dfdb9dcb4ce9219fc27d496d6faca4ddc2

.circleci/config.yml

@@ -178,12 +178,6 @@ commands:
           paths:
             - ".git"
 
-  setup_artifacts:
-    steps:
-      - run:
-          name: Initial Setup
-          command: mkdir -p ./reports/{buck,build,junit,outputs}
-
   setup_ruby:
     parameters:
       ruby_version:
@@ -639,7 +633,6 @@ jobs:
     executor: node-browsers-small
     steps:
       - checkout
-      - setup_artifacts
       - run_yarn
 
       - run:
@@ -703,7 +696,6 @@ jobs:
     executor: << parameters.executor >>
     steps:
       - checkout
-      - setup_artifacts
       - run_yarn
       - run:
           name: Install rsync
@@ -750,7 +742,6 @@ jobs:
       - REPORTS_DIR: "./reports/junit"
     steps:
       - checkout_code_with_cache
-      - setup_artifacts
       - setup_ruby:
           ruby_version: << parameters.ruby_version >>
       - brew_install:
@@ -1019,7 +1010,6 @@ jobs:
     executor: reactnativeandroid-xlarge
     steps:
       - checkout
-      - setup_artifacts
       - run_yarn
       - run:
           name: Set React Native Version to "dry-run"