Metrics - `airflow_ti.start.*` and `airflow_ti.finish.*`

### Apache Airflow version 2.6.2 ### What happened There is an issue with the `airflow_ti.start.<dag_id>.<task_id>.<state>` and `airflow_ti.finish.<dag_id>.<task_id>.<state>` metrics when running Airflow with OpenTelemetry. Both of those get emitted when run with StatsD but are flaky under OTel. I am submitting this as an Issue since I will be a little distracted for the next bit and figured someone may be able to have a look in the meantime. Please do not assign it to me, I'll get it when I can is nobody else does. ### What you think should happen instead Behavior should be consistent. ### How to reproduce To reproduce, you can run Breeze with the statsd or the otel integration (for example `breeze start-airflow --integration otel`) and run one or more of the following DAGs, then open the [OTel](http://localhost:28889/metrics) or [StatsD](http://localhost:29102/metrics) raw data view to verify. These two DAGs don't generate any `airflow_ti_finish.*` metrics: ``` from airflow import DAG from airflow.decorators import task from airflow.utils.timezone import datetime @task def task1(): return 'Hello' @task def task2(): return 'World!' @task def task3(in1, in2): print(f'{in1} {in2}') with DAG( dag_id='taskflow_demo', start_date=datetime(2021, 1, 1), schedule=None, catchup=False ) as dag: task3(task1(), task2()) ``` ``` import time from airflow import DAG from airflow.decorators import task from airflow.utils.timezone import datetime @task def task1(): time.sleep(10) with DAG( dag_id='sleep_10', start_date=datetime(2021, 1, 1), schedule=None, catchup=False ) as dag: task1() ``` but this one: ``` import time from datetime import timedelta from airflow import DAG from airflow.decorators import task from airflow.utils.timezone import datetime def sla_callback(dag, task_list, blocking_task_list, slas, blocking_tis): print( "The callback arguments are: ", { "dag": dag, "tas…