Fix get task by id method

[SystemKeeper]

Refs:

https://github.com/nextcloud/server/blob/67a02fa611c8a88dc500cff2c93033bb3db436b7/core/Controller/TaskProcessingApiController.php#L162-L178

https://github.com/nextcloud/server/blob/67a02fa611c8a88dc500cff2c93033bb3db436b7/core/Controller/TextProcessingApiController.php#L140-L155

https://github.com/nextcloud/server/blob/67a02fa611c8a88dc500cff2c93033bb3db436b7/core/Controller/TextToImageApiController.php#L115-L132

[SystemKeeper]

/backport to stable30

[SystemKeeper]

/backport bc1c292 to stable29

[SystemKeeper]

/backport bc1c292 to stable28

[SystemKeeper]

Now that I look at it again, I think the note about ratelimit is also wrong here and only belongs to the schedule endpoint?
And it seems that status is not an int, but a string?

[marcelklehr]

Yes, well spotted! The POST should be a GET, the ratelimit should be for the schedule endpoint. For TaskProcessing the status is a string nowadays, indeed. Initially it was an int.

[rakekniven]

@SystemKeeper Is it ok after rebasing?

[SystemKeeper]

That PR differs now from the original idea, let me take another look.

[rakekniven]

That PR differs now from the original idea, let me take another look.

I wasn't happy about the diff after updating branch.

@SystemKeeper Thank you

[SystemKeeper]

The part I wanted to update, was removed and linked to the OpenAPI docs in 50948b9. That's why the diff now looks weird. We can close this then, the OpenAPI docs should be fine.
Thanks for taking a look @rakekniven !