Use readConcern afterClusterTime for initsync oplog queries

(function() { 'use strict';   load('jstests/replsets/rslib.js'); const basename = 'initial_sync_visibility';   jsTestLog('Bring up set'); const rst = new ReplSetTest({name: basename, nodes: 1}); rst.startSet(); rst.initiate();   const primary = rst.getPrimary(); const primaryDB = primary.getDB(basename);   jsTestLog('Create a collection'); assert.writeOK(primaryDB['coll'].save({_id: "visible"})); jsTestLog('Make sure synced'); rst.awaitReplication();   jsTestLog('Activate WT visibility failpoint and write an invisible document'); assert.commandWorked(primaryDB.adminCommand( {configureFailPoint: 'WTPausePrimaryOplogDurabilityLoop', mode: 'alwaysOn'})); assert.writeOK(primaryDB['coll'].save({_id: "invisible"}));   jsTestLog('Bring up a new node'); const secondary = rst.add({setParameter: 'numInitialSyncAttempts=3'}); rst.reInitiate(); assert.eq(primary, rst.getPrimary(), 'Primary changed after reconfig');   jsTestLog('Wait for new node to start cloning'); secondary.setSlaveOk(); const secondaryDB = secondary.getDB(basename); wait(function() { return secondaryDB.stats().collections >= 1; }, 'never saw new node starting to clone, was waiting for collections in: ' + basename);   jsTestLog('Disable WT visibility failpoint on primary making all visible.'); assert.commandWorked(primaryDB.adminCommand( {configureFailPoint: 'WTPausePrimaryOplogDurabilityLoop', mode: 'off'}));   jsTestLog('Wait for both nodes to be up-to-date'); rst.awaitSecondaryNodes(); rst.awaitReplication();   jsTestLog('Check all OK'); rst.checkReplicatedDataHashes(); rst.stopSet(15); })();