Remove duplicate CI env vars from Actions workflows (#23921)

Author: JamesMGreene

.github/workflows/repo-sync.yml

@@ -113,7 +113,6 @@ jobs:
         uses: repo-sync/github-sync@3832fe8e2be32372e1b3970bbae8e7079edeec88
         env:
           GITHUB_TOKEN: ${{ secrets.OCTOMERGER_PAT_WITH_REPO_AND_WORKFLOW_SCOPE }}
-          CI: true
         with:
           source_repo: ${{ secrets.SOURCE_REPO }} # https://${access_token}@github.com/github/the-other-repo.git
           source_branch: main

.github/workflows/test-windows.yml

@@ -20,9 +20,6 @@ concurrency:
   group: '${{ github.workflow }} @ ${{ github.event.pull_request.head.label || github.head_ref || github.ref }}'
   cancel-in-progress: true
 
-env:
-  CI: true
-
 jobs:
   test:
     runs-on: windows-latest

.github/workflows/test.yml

@@ -20,9 +20,6 @@ concurrency:
   group: '${{ github.workflow }} @ ${{ github.event.pull_request.head.label || github.head_ref || github.ref }}'
   cancel-in-progress: true
 
-env:
-  CI: true
-
 jobs:
   test:
     # Run on self-hosted if the private repo or ubuntu-latest if the public repo