test: remove util from child-process test
Simple PR inspired by #3324
Util is being used in test-child-process-spawnsync-input.js for string templating.
This PR replaces that with a template string.s
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
Simple PR inspired by #3324
Util is being used in test-child-process-spawnsync-input.js for string templating.
This PR replaces that with a template string.s