Cleanup the commitlies code (facebook#38889)

Summary:
Pull Request resolved: facebook#38889

As we don't really use the commitlies code in CircleCI, I'm cleaning up some of the code used to publish artifacts to the user.

Changelog:
[Internal] [Changed] - Cleanup the commitlies code

Reviewed By: cipolleschi

Differential Revision: D48189398

fbshipit-source-id: c4591ee290eba49224322d44a32052ff292ccbed

.circleci/config.yml

@@ -17,8 +17,6 @@ references:
     environment:
       - GIT_COMMIT_DESC: git log --format=oneline -n 1 $CIRCLE_SHA1
       # The public github tokens are publicly visible by design
-      - PUBLIC_PULLBOT_GITHUB_TOKEN_A: &github_pullbot_token_a "a6edf8e8d40ce4e8b11a"
-      - PUBLIC_PULLBOT_GITHUB_TOKEN_B: &github_pullbot_token_b "150e1341f4dd9c944d2a"
       - PUBLIC_ANALYSISBOT_GITHUB_TOKEN_A: &github_analysisbot_token_a "312d354b5c36f082cfe9"
       - PUBLIC_ANALYSISBOT_GITHUB_TOKEN_B: &github_analysisbot_token_b "07973d757026bdd9f196"
       # Homebrew currently breaks while updating:
@@ -36,8 +34,6 @@ references:
       # Repeated here, as the environment key in this executor will overwrite the one in defaults
       - PUBLIC_ANALYSISBOT_GITHUB_TOKEN_A: *github_analysisbot_token_a
       - PUBLIC_ANALYSISBOT_GITHUB_TOKEN_B: *github_analysisbot_token_b
-      - PUBLIC_PULLBOT_GITHUB_TOKEN_A: *github_pullbot_token_a
-      - PUBLIC_PULLBOT_GITHUB_TOKEN_B: *github_pullbot_token_b
 
   hermes_workspace_root: &hermes_workspace_root
     /tmp/hermes
@@ -1914,7 +1910,7 @@ jobs:
           paths:
             - maven-local
 
-      # START: Commitlies
+      # START: Dry-run
       # Provide a react-native package for this commit as a Circle CI release artifact.
       - when:
           condition:
@@ -1936,18 +1932,7 @@ jobs:
                 root: .
                 paths:
                   - build/*
-      # END: Commitlies
-
-      # START: Commits from pull requests
-      # When building commits from pull requests, leave a comment on the PR with a link to build artifacts
-      - when:
-          condition:
-            matches: { pattern: '^pull\/.*$', value: << pipeline.git.branch >> }
-          steps:
-            - run:
-                name: Post link to PR build artifacts (pull-bot)
-                command: GITHUB_TOKEN="$PUBLIC_PULLBOT_GITHUB_TOKEN_A""$PUBLIC_PULLBOT_GITHUB_TOKEN_B" scripts/circleci/post-artifacts-link.sh || true
-      # END: Commits from pull requests
+      # END: Dry-run
 
       # START: Stable releases
       - when: