♻️ don't fetch bucket data all the time

Issue: CLDSRV-632

Author: DarkIsDude

lib/routes/routeBackbeat.js

@@ -45,6 +45,7 @@ const { versioningPreprocessing }
 const {promisify} = require('util');
 
 const versioningPreprocessingPromised = promisify(versioningPreprocessing);
+metadata.getObjectMDPromised = promisify(metadata.getObjectMD);
 metadata.getBucketAndObjectMDPromised = promisify(metadata.getBucketAndObjectMD);
 
 const { CURRENT_TYPE, NON_CURRENT_TYPE, ORPHAN_DM_TYPE } = constants.lifecycleListing;
@@ -664,16 +665,14 @@ function putMetadata(request, response, bucketInfo, objMd, log, callback) {
             },
             async () => {
                 if (versioning && !objMd) {
-                    const masterObjectAndBucket =
-                        await metadata.getBucketAndObjectMDPromised(bucketName, objectKey, {}, log);
+                    const masterMD = await metadata.getObjectMDPromised(bucketName, objectKey, {}, log);
 
-                    if (!masterObjectAndBucket.obj) {
+                    if (!masterMD) {
                         return;
                     }
 
-                    const masterObject = JSON.parse(masterObjectAndBucket.obj);
                     const versioningPreprocessingResult =
-                        await versioningPreprocessingPromised(bucketName, bucketInfo, objectKey, masterObject, log);
+                        await versioningPreprocessingPromised(bucketName, bucketInfo, objectKey, masterMD, log);
 
                     if (versioningPreprocessingResult?.nullVersionId) {
                         omVal.nullVersionId = versioningPreprocessingResult.nullVersionId;