docs: improve jobs autorun docs, adds e2e test (#12196)

This clarifies that jobs.autoRun only *runs* already-queued jobs. It does not queue the jobs for you.

Also adds an e2e test as this functionality had no e2e coverage

test/database/int.spec.ts

@@ -71,9 +71,7 @@ describe('database', () => {
   })
 
   afterAll(async () => {
-    if (typeof payload.db.destroy === 'function') {
-      await payload.db.destroy()
-    }
+    await payload.destroy()
   })
 
   describe('id type', () => {

test/database/postgres-relationships-v2-v3-migration/int.spec.ts

@@ -46,6 +46,6 @@ describe('Postgres relationships v2-v3 migration', () => {
     expect(hasErr).toBeFalsy()
 
     await payload.db.dropDatabase({ adapter: payload.db as any })
-    await payload.db.destroy()
+    await payload.destroy()
   })
 })

test/database/up-down-migration/int.spec.ts

@@ -53,6 +53,6 @@ describe('SQL migrations', () => {
     await payload.db.migrateDown()
 
     await payload.db.dropDatabase({ adapter: payload.db as any })
-    await payload.db.destroy?.()
+    await payload.destroy()
   })
 })