chore: Test against both SDK test harness v2 and v3

Author: keelerm84

.github/workflows/ci.yml

@@ -61,6 +61,23 @@ jobs:
           test_service_port: 9000
           token: ${{ secrets.GITHUB_TOKEN }}
 
+      - name: start contract test service
+        run: make start-contract-test-service-bg
+
+      - name: Run contract tests v2
+        uses: launchdarkly/gh-actions/actions/contract-tests@mk/sdk-1716/opt-to-not-shutdown
+        with:
+          test_service_port: 9000
+          token: ${{ secrets.GITHUB_TOKEN }}
+          stop_service: 'false'
+
+      - name: Run contract tests v3
+        uses: launchdarkly/gh-actions/actions/contract-tests@mk/sdk-1716/opt-to-not-shutdown
+        with:
+          test_service_port: 9000
+          token: ${{ secrets.GITHUB_TOKEN }}
+          version: v3.0.0-alpha.1
+
   windows:
     runs-on: windows-latest