[CI] Fix label race condition between LabelPrs and pr-bot-pr-updates (apache#40141)

Author: Abacn

.github/workflows/label_prs.yml

@@ -19,6 +19,9 @@
 name: LabelPrs
 on: [pull_request_target]
 permissions: read-all
+concurrency:
+  group: pr-bot-labels-${{ github.event.pull_request.number || github.event.issue.number }}
+  cancel-in-progress: false
 jobs:
   label:
     runs-on: ubuntu-latest

.github/workflows/pr-bot-pr-updates.yml

@@ -20,6 +20,9 @@ on:
   issue_comment:
     types: [created]
 permissions: read-all
+concurrency:
+  group: pr-bot-labels-${{ github.event.pull_request.number || github.event.issue.number }}
+  cancel-in-progress: false
 jobs:
   process-pr-update:
     # Give GITHUB_TOKEN permissions to write pull request comments and to the state branch, and read PR related info
@@ -30,8 +33,8 @@ jobs:
       issues: read
       statuses: read
 
-    # Don't run on forks
-    if: github.repository == 'apache/beam'
+    # Don't run on forks or non-PR issue comments
+    if: github.repository == 'apache/beam' && (github.event_name != 'issue_comment' || github.event.issue.pull_request)
     runs-on: ubuntu-latest
 
     steps:

scripts/ci/pr-bot/processPrUpdate.ts

@@ -138,7 +138,8 @@ async function setNextActionReviewers(
     console.log("No reviewers assigned, dont need to manipulate attention set");
     return;
   }
-  const existingLabels = payload.issue?.labels || payload.pull_request?.labels;
+  const existingLabels =
+    pull.labels || payload.issue?.labels || payload.pull_request?.labels;
   await nextActionReviewers(pull.number, existingLabels);
   let prState = await stateClient.getPrState(pull.number);
   prState.nextAction = REVIEWERS_ACTION;