chore(github): add warden configuration (#5484)

### Description
Adds warden code reviews to our Github workflows.

Author: ericapisani

.github/workflows/warden.yml

@@ -0,0 +1,24 @@
+name: Warden
+
+on:
+  pull_request:
+    types: [opened, synchronize, reopened]
+
+# contents: write required for resolving review threads via GraphQL
+# See: https://github.com/orgs/community/discussions/44650
+permissions:
+  contents: write
+  pull-requests: write
+  checks: write
+
+jobs:
+  review:
+    runs-on: ubuntu-latest
+    env:
+      WARDEN_MODEL: ${{ secrets.WARDEN_MODEL }}
+      WARDEN_SENTRY_DSN: ${{ secrets.WARDEN_SENTRY_DSN }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: getsentry/warden@v0
+        with:
+          anthropic-api-key: ${{ secrets.WARDEN_ANTHROPIC_API_KEY }}