fix: emit taskComplete when adding cached tasks

This clears the error and cancelled node states on the dashboard's stack
graph tab e.g. when reverting the underlying code to a
functioning/correct version that had previously been
built/deployed/tested during the execution of the current command.

garden-service/src/task-graph.ts

@@ -119,6 +119,11 @@ export class TaskGraph {
         key: task.getKey(),
         version: task.version,
       })
+    } else {
+      const result = this.resultCache.get(task.getKey(), task.version.versionString)
+      if (result) {
+        this.garden.events.emit("taskComplete", result)
+      }
     }
   }
 

garden-service/test/unit/src/task-graph.ts

@@ -19,12 +19,6 @@ interface TestTaskOptions {
   throwError?: boolean
 }
 
-const testTaskVersion = {
-  versionString: "12345-6789",
-  dependencyVersions: {},
-  files: [],
-}
-
 class TestTask extends BaseTask {
   type: TaskType = "test"
   name: string
@@ -159,6 +153,13 @@ describe("task-graph", () => {
       await graph.process([repeatedTask])
 
       expect(garden.events.eventLog).to.eql([
+        {
+          name: "taskComplete",
+          payload: {
+            dependencyResults: {}, description: "a", key: task.getKey(), type: "test", name: "a",
+            output: { dependencyResults: {}, result: "result-a" },
+          },
+        },
         { name: "taskGraphProcessing", payload: { startedAt: now } },
         { name: "taskGraphComplete", payload: { completedAt: now } },
       ])