### Apache Airflow version

2.1.2

### What happened

Task duration view for triggered dags shows all dag runs instead of n last. Changing the number of runs in the `Runs` drop-down menu doesn't change the view. Additionally the chart loads slowly, it show all dag runs.

![screenshot_2022-03-05_170203](https://user-images.githubusercontent.com/7863204/156891332-5e461661-970d-49bf-82a8-5dd1da57bb02.png)
 

### What you expected to happen

The number of shown dag runs is 25 (like for scheduled dags), and the last runs are shown. The number of runs button should allow to increase / decrease the number of shown dag runs (respectively the task times of the dag runs).

### How to reproduce

Trigger a dag multiple (> 25) times. Look at the "Task Duration" chart.

### Operating System

Linux

### Versions of Apache Airflow Providers

_No response_

### Deployment

Official Apache Airflow Helm Chart

### Deployment details

_No response_

### Anything else

_No response_

### Are you willing to submit 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)

#
#
#
from __future__ import annotations
import datetime
import io
import logging
import os
import pickle
import re
import sys
from contextlib import redirect_stdout
from datetime import timedelta
from pathlib import Path
from tempfile import NamedTemporaryFile
from unittest import mock
from unittest.mock import patch
import jinja2
import pendulum
import pytest
import time_machine
from dateutil.relativedelta import relativedelta
from sqlalchemy import inspect
import airflow
from airflow import models, settings
from airflow.configuration import conf
from airflow.datasets import Dataset
from airflow.decorators import task as task_decorator
from airflow.exceptions import (
    AirflowException,