Add project files.

src/modules/Elsa.Quartz/Jobs/ResumeWorkflowJob.cs

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+using Elsa.Common;
+using Elsa.Common.Multitenancy;
+using Elsa.Extensions;
+using Elsa.Scheduling;
+using Elsa.Workflows.Models;
+using Elsa.Workflows.Runtime;
+using Elsa.Workflows.Runtime.Messages;
+using Quartz;
+
+namespace Elsa.Quartz.Jobs;
+
+/// <summary>
+/// A job that resumes a workflow.
+/// </summary>
+public class ResumeWorkflowJob(IWorkflowRuntime workflowRuntime, IJsonSerializer jsonSerializer, ITenantFinder tenantFinder, ITenantAccessor tenantAccessor) : IJob
+{
+    /// <inheritdoc />
+    public async Task Execute(IJobExecutionContext context)
+    {
+        var tenant = await context.GetTenantAsync(tenantFinder);
+        using (tenantAccessor.PushContext(tenant))
+        {
+            var map = context.MergedJobDataMap;
+            var serializedActivityHandle = (string)map.Get(nameof(ScheduleExistingWorkflowInstanceRequest.ActivityHandle));
+            var activityHandle = serializedActivityHandle != null! ? jsonSerializer.Deserialize<ActivityHandle>(serializedActivityHandle) : null;
+            var workflowInstanceId = (string)map.Get(nameof(ScheduleExistingWorkflowInstanceRequest.WorkflowInstanceId));
+            var workflowClient = await workflowRuntime.CreateClientAsync(workflowInstanceId, context.CancellationToken);
+            var request = new RunWorkflowInstanceRequest
+            {
+                BookmarkId = (string)map.Get(nameof(ScheduleExistingWorkflowInstanceRequest.BookmarkId)),
+                ActivityHandle = activityHandle,
+                Input = map.GetDictionary(nameof(ScheduleExistingWorkflowInstanceRequest.Input)),
+                Properties = map.GetDictionary(nameof(ScheduleExistingWorkflowInstanceRequest.Properties)),
+            };
+            await workflowClient.RunInstanceAsync(request, cancellationToken: context.CancellationToken);
+        }
+    }
+}