Modify an existing batch Apex job to raise BatchApexErrorEvents

BatchApexErrorTrigger.trg

trigger BatchApexErrorTrigger on BatchApexErrorEvent (after insert) {
    List<BatchLeadConvertErrors__c> List_LeadConvertError = new List<BatchLeadConvertErrors__c>();
    
    for(BatchApexErrorEvent event: trigger.new){
    	BatchLeadConvertErrors__c lcerror = new BatchLeadConvertErrors__c();
        lcerror.AsyncApexJobId__c = event.AsyncApexJobId;
        lcerror.Records__c = event.JobScope;
        lcerror.StackTrace__c = event.StackTrace;
        
        List_LeadConvertError.add(lcerror);
    }
    if(List_LeadConvertError.size() > 0 && List_LeadConvertError != null){
    	insert List_LeadConvertError;
    }
}

BatchLeadConvert.cls

public with sharing class BatchLeadConvert implements 
Database.Batchable<SObject>, Database.RaisesPlatformEvents{

    private final String CONVERTED_STATUS = [SELECT Id, MasterLabel FROM LeadStatus WHERE IsConverted=true LIMIT 1].MasterLabel;

    public Database.QueryLocator start(Database.BatchableContext ctx){
        return Database.getQueryLocator([SELECT Id FROM Lead WHERE ConvertedContactId = null]);
    }

    public void execute(Database.BatchableContext ctx, List<Lead> records){
        List<Database.LeadConvert> leadConverts = new List<Database.LeadConvert>();
        for(Lead record:records){
            Database.LeadConvert lc = new Database.LeadConvert();
            lc.setConvertedStatus(CONVERTED_STATUS);
            lc.setLeadId(record.Id);

            leadConverts.add(lc);
        }
        Database.convertLead(leadConverts, true);
    }

    public void finish(Database.BatchableContext ctx){

    }
}