Have tasks in graph view show % of total execution time for that run?

### Description

In graph view, show the % of that tasks' execution time compared to total execution time of the dagrun. I've also seen other cases where a small bar graph is shown in the task rectangle but I think % is probably good enough.

it would be really helpful to see at a glance from the graph view which tasks are taking the longest.

https://airflow.apache.org/docs/apache-airflow/stable/_images/dag_run_graph1.png

### Use case/motivation

for quickly triaging a long running dagrun

### Related issues

_No response_

### Are you willing to submit a PR?

- [ ] Yes I am willing to submit a PR!

### Code of Conduct

- [x] I agree to follow this project's [Code of Conduct](https://github.com/apache/airflow/blob/main/CODE_OF_CONDUCT.md)