fix(data-api): remove nullable fields from data-api test cases

[danistrebel]

Description

What's changed, or what was fixed?

• Fixes the data-api test failures in the nighty because the bike rental dataset includes null values:

Query to count entries that would fail the test:

SELECT  count(rental_id) FROM `bigquery-public-data.london_bicycles.cycle_hire`  where duration IS NULL OR bike_id IS NULL

Result:

19600

Issues Fixed

• Fixes: Nighly 🤞

Housekeeping

(please check all that apply [x], do not edit the text)

• [x] I have run all the tests locally and they all pass.
• [x] I have followed the relevant style guide for my changes.

Full Repo Validation Required

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• [ ] PR requires full pipeline run (Run for changes only by default).

CC: @apigee-devrel-reviewers

[danistrebel]

/gcbrun

[apigee-devrel-bot]

Pipeline Report

Pipeline	Result	Elapsed Wall Time
references/data-api	pass	106s
TOTAL PIPELINE	pass	106s

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Commit version: 02ab2b9