chore: use shared semantic PR title workflow (#630)

Author: dustinbyrne

.github/workflows/lint-pr.yml

@@ -15,12 +15,7 @@ concurrency:
 jobs:
   lint-pr:
     name: Validate PR title against Conventional Commits
-    runs-on: ubuntu-24.04
-    timeout-minutes: 5
     permissions:
       contents: read
       pull-requests: read
-    steps:
-      - uses: amannn/action-semantic-pull-request@48f256284bd46cdaab1048c3721360e808335d50 # pin v6.1.1
-        env:
-          GITHUB_TOKEN: ${{ github.token }}
+    uses: PostHog/.github/.github/workflows/semantic-pr-title.yml@926dd076f0c796f7531177ae5cfcf1cf7cf0aeb3