Make the tasks and operators ids consistent

[tatiana]

Please describe the feature you'd like to see At the moment, if the user does not define task_id, we are naming tasks inconsistently across different operators and decorators. Some are prefixed or suffixed with _, others are not.

Describe the solution you'd like

• By default, name based on the functionality, without _, eg. load_file
• If the name is already used by another task, suffix with _ and a unique identifier

Additional context Example of how the tutorial currently renders:

Acceptance Criteria

• [ ] All checks and tests in the CI should pass
• [ ] All decorators and tasks are named consistently (both the tutorial and the other ones)