fix(plugin-import-export): incorrect config extension of jobs (#12730)

### What?
In a project that has `jobs` configured and the import/export plugin
will error on start:

`payload-jobs validation failed: taskSlug: createCollectionExport is not
a valid enum value for path taskSlug.`

### Why?

The plugin was not properly extending the jobs configuration.

### How?

Properly extend existing config.jobs to add the `createCollectionExport`
task.

Fixes #

packages/plugin-import-export/src/export/createExport.ts

@@ -10,7 +10,7 @@ import { getCustomFieldFunctions } from './getCustomFieldFunctions.js'
 import { getFilename } from './getFilename.js'
 import { getSelect } from './getSelect.js'
 
-type Export = {
+export type Export = {
   collectionSlug: string
   /**
    * If true, enables debug logging

packages/plugin-import-export/src/export/getCreateExportCollectionTask.ts

@@ -1,11 +1,16 @@
-import type { Config, TaskHandler, User } from 'payload'
+import type { Config, TaskConfig, User } from 'payload'
 
-import type { CreateExportArgs } from './createExport.js'
+import type { CreateExportArgs, Export } from './createExport.js'
 
 import { createExport } from './createExport.js'
 import { getFields } from './getFields.js'
 
-export const getCreateCollectionExportTask = (config: Config): TaskHandler<any, string> => {
+export const getCreateCollectionExportTask = (
+  config: Config,
+): TaskConfig<{
+  input: Export
+  output: object
+}> => {
   const inputSchema = getFields(config).concat(
     {
       name: 'user',
@@ -22,7 +27,6 @@ export const getCreateCollectionExportTask = (config: Config): TaskHandler<any,
   )
 
   return {
-    // @ts-expect-error plugin tasks cannot have predefined type slug
     slug: 'createCollectionExport',
     handler: async ({ input, req }: CreateExportArgs) => {
       let user: undefined | User
@@ -41,15 +45,9 @@ export const getCreateCollectionExportTask = (config: Config): TaskHandler<any,
       await createExport({ input, req, user })
 
       return {
-        success: true,
+        output: {},
       }
     },
     inputSchema,
-    outputSchema: [
-      {
-        name: 'success',
-        type: 'checkbox',
-      },
-    ],
   }
 }

packages/plugin-import-export/src/index.ts

@@ -28,11 +28,7 @@ export const importExportPlugin =
     )
 
     // inject the createExport job into the config
-    config.jobs =
-      config.jobs ||
-      ({
-        tasks: [getCreateCollectionExportTask(config)],
-      } as unknown as JobsConfig) // cannot type jobs config inside of plugins
+    ;((config.jobs ??= {}).tasks ??= []).push(getCreateCollectionExportTask(config))
 
     let collectionsToUpdate = config.collections