Remove unused exports & dead code (using Knip) (#56817)

Co-authored-by: Jake Bailey <5341706+jakebailey@users.noreply.github.com>

.github/workflows/ci.yml

@@ -83,6 +83,20 @@ jobs:
       - name: Linter
         run: npm run lint
 
+  knip:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
+      - uses: actions/setup-node@60edb5dd545a775178f52524783378180af0d1f8 # v4.0.2
+        with:
+          node-version: '*'
+          check-latest: true
+      - run: npm ci
+
+      - name: Unused exports
+        run: npm run knip
+
   format:
     runs-on: ubuntu-latest