fix: Build js-contract-test-utils before contract-test service locally

Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

Author: joker23

packages/sdk/node-client/contract-tests/run-contract-tests.sh

@@ -20,6 +20,7 @@ SUPPRESSIONS="${SUPPRESSIONS:-$SCRIPT_DIR/testharness-suppressions.txt}"
 VERSION="${VERSION:-v2}"
 
 yarn workspaces foreach -pR --topological-dev --from '@launchdarkly/node-client-sdk' run build
+yarn workspace @launchdarkly/js-contract-test-utils build:client
 yarn workspace @launchdarkly/node-client-sdk-contract-tests build
 
 yarn workspace @launchdarkly/node-client-sdk-contract-tests start &