fix: ensure actions logs are transferred when a task is done (#10008)

Logs moving out of the database to the filesystem (actions_module.TransferLogsAndUpdateLogInStorage)
did not happen in the following cases:

- the runner does not send an UpdateLog message with NoMore == true
- StopTask is called (canceling from the web.UI, canceling a scheduled
  task)

This is fixed by consistently calling actions_service.TransferLogsAndUpdateLogInStorage when
a task is completed by:

- UpdateTaskByState if it concludes with Status.IsDone
- StopTask

Test coverage exists at:

- TestActionsDownloadTaskLogs
  will fail if UpdateTaskByState does not call TransferLogsAndUpdateLogInStorage when
  when task.Status.IsDone()
  stat .../tests/integration/gitea-integration-sqlite/data/actions_log/user2/actions-download-task-logs/48/72.log.zst: no such file or directory
- TestActionNowDoneNotification
  will fail if StopTask returns on error when calling TransferLogsAndUpdateLogInStorage
  Error Trace:	.../tests/integration/actions_run_now_done_notification_test.go:142

Refs https://codeberg.org/forgejo/forgejo/issues/9999

---

Note on backporting: it cannot be easily backported to v11.0 because it would require a more involved backport to untangle circular dependencies. It is also not essential in the context of https://codeberg.org/forgejo/forgejo/issues/9999 for instances being polluted by logs that stay in the database. The new [cron job](https://codeberg.org/forgejo/forgejo/pulls/10009) that disposes of them will take care of those daily and they will not be growing the database indefinitely.

<!--start release-notes-assistant-->

## Release notes
<!--URL:https://codeberg.org/forgejo/forgejo-->
- Bug fixes
  - [PR](https://codeberg.org/forgejo/forgejo/pulls/10008): <!--number 10008 --><!--line 0 --><!--description ZW5zdXJlIGFjdGlvbnMgbG9ncyBhcmUgdHJhbnNmZXJyZWQgd2hlbiBhIHRhc2sgaXMgZG9uZQ==-->ensure actions logs are transferred when a task is done<!--description-->
<!--end release-notes-assistant-->

Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/10008
Reviewed-by: Michael Kriese <michael.kriese@gmx.de>
Co-authored-by: Earl Warren <contact@earl-warren.org>
Co-committed-by: Earl Warren <contact@earl-warren.org>

services/actions/task.go

@@ -208,7 +208,7 @@ func StopTask(ctx context.Context, taskID int64, status actions_model.Status) er
 		}
 	}
 
-	return nil
+	return TransferLogsAndUpdateLogInStorage(ctx, task)
 }
 
 // UpdateTaskByState updates the task by the state.
@@ -264,6 +264,12 @@ func UpdateTaskByState(ctx context.Context, runnerID int64, state *runnerv1.Task
 		}
 	}
 
+	if task.Status.IsDone() {
+		if err := TransferLogsAndUpdateLogInStorage(ctx, task); err != nil {
+			return nil, err
+		}
+	}
+
 	if err := task.LoadAttributes(ctx); err != nil {
 		return nil, err
 	}