Creating a subtask does not create a 'X created blocking task Y' message in the parent task.
For example:
- https://phabricator.wikimedia.org/T90574 was created using the 'Create Subtask' button on https://phabricator.wikimedia.org/T90534 .
- No message 'valhallasw created a blocking task: T90574' is shown
- https://phabricator.wikimedia.org/T90535 was linked explicitly using 'add a blocking task'
- The message 'yuvipanda added a blocked task: T90535' is shown
Steps to reproduce:
- On task A, click 'Create subtask'
- Create a new task
- Go back to task A
- There is no news message
Expected behavior:
- Some message is shown on the parent task