[Task]: Use read_gbq in flight delays example

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#22,911 opened on Aug 26, 2022 1 comment 0 reactions 0 assignees View on GitHub

dataframe dsl P2 task

Description

### What needs to happen?

We should use read_gbq in the flight delay example, rather than calling BigQueryIO directly.

Part of #20810

### Issue Priority

Priority: 2

### Issue Component

Component: dsl-dataframe

This issue has not been assessed yet.