chore(spanner): use different project for directpath presubmit integration tests#3494

sakthivelmanii merged 3 commits intogoogleapis:maingoogleapis/java-spanner:mainfrom

sakthivelmanii:use-different-projects-for-presubmitssakthivelmanii/java-spanner:use-different-projects-for-presubmitsCopy head branch name to clipboard