Bug: obsolete TODOs and parameter in `worker.rs`

Original report: https://github.com/qorix-group/inc_orchestrator_internal/issues/230
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### Describe the bug:

There's an obsolete TODO list in `impl Worker` docstring.
There's an unused `_prio` parameter in `Worker::new` that won't be used -> priority is set using `Worker::start` `thread_params` parameter.

`src/async_runtime/src/scheduler/workers/worker.rs`

### Steps to reproduce the behavior:
N/A

### Observed behavior:
N/A

### Expected behavior
N/A

### Occurrence:
N/A

### Attachments / Logs: