improve logging coverage when uploaing sarif files

lib/fingerprints.js

@@ -238,6 +238,7 @@ exports.resolveUriToFile = resolveUriToFile;
 // Compute fingerprints for results in the given sarif file
 // and return an updated sarif file contents.
 async function addFingerprints(sarif, sourceRoot, logger) {
+    logger.info(`Adding fingerprints to SARIF file`);
     // Gather together results for the same file and construct
     // callbacks to accept hashes for that file and update the location
     const callbacksByFile = {};