chore(workflow-engine): export cancel method (#11844)

What:
  * Workflow engine exports the method `cancel` to revert a workflow.

packages/modules/workflow-engine-inmemory/integration-tests/__fixtures__/index.ts

@@ -4,4 +4,5 @@ export * from "./workflow_async"
 export * from "./workflow_conditional_step"
 export * from "./workflow_idempotent"
 export * from "./workflow_step_timeout"
+export * from "./workflow_sync"
 export * from "./workflow_transaction_timeout"

packages/modules/workflow-engine-inmemory/integration-tests/__fixtures__/workflow_sync.ts

@@ -0,0 +1,64 @@
+import {
+  createStep,
+  createWorkflow,
+  StepResponse,
+  WorkflowResponse,
+} from "@medusajs/framework/workflows-sdk"
+
+const step_1 = createStep(
+  "step_1",
+  jest.fn((input) => {
+    input.test = "test"
+    return new StepResponse(input, { compensate: 123 })
+  }),
+  jest.fn((compensateInput) => {
+    if (!compensateInput) {
+      return
+    }
+
+    return new StepResponse({
+      reverted: true,
+    })
+  })
+)
+
+const step_2 = createStep(
+  "step_2",
+  jest.fn((input, context) => {
+    if (input) {
+      return new StepResponse({ notAsyncResponse: input.hey })
+    }
+  }),
+  jest.fn((_, context) => {
+    return new StepResponse({
+      step: context.metadata.action,
+      idempotency_key: context.metadata.idempotency_key,
+      reverted: true,
+    })
+  })
+)
+
+const step_3 = createStep(
+  "step_3",
+  jest.fn((res) => {
+    return new StepResponse({
+      done: {
+        inputFromSyncStep: res.notAsyncResponse,
+      },
+    })
+  })
+)
+
+createWorkflow(
+  {
+    name: "workflow_sync",
+    idempotent: true,
+  },
+  function (input) {
+    step_1(input)
+
+    const ret2 = step_2({ hey: "oh" })
+
+    return new WorkflowResponse(step_3(ret2))
+  }
+)

packages/modules/workflow-engine-inmemory/integration-tests/__tests__/index.spec.ts

@@ -300,6 +300,26 @@ moduleIntegrationTestRunner<IWorkflowEngineService>({
           expect(onFinish).toHaveBeenCalledTimes(0)
         })
 
+        it("should cancel and revert a completed workflow", async () => {
+          const workflowId = "workflow_sync"
+
+          const { acknowledgement, transaction: trx } =
+            await workflowOrcModule.run(workflowId, {
+              input: {
+                value: "123",
+              },
+            })
+
+          expect(trx.getFlow().state).toEqual("done")
+          expect(acknowledgement.hasFinished).toBe(true)
+
+          const { transaction } = await workflowOrcModule.cancel(workflowId, {
+            transactionId: acknowledgement.transactionId,
+          })
+
+          expect(transaction.getFlow().state).toEqual("reverted")
+        })
+
         it("should run conditional steps if condition is true", (done) => {
           void workflowOrcModule.subscribe({
             workflowId: "workflow_conditional_step",