bigquery: address snippet feedback.

[shollyman]

Removes duplicated snippet, addresses comments about location, ensures the snippet is being exercised in tests.

[codecov]

Codecov Report

Merging #5475 into master will decrease coverage by 0.31%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #5475      +/-   ##
============================================
- Coverage     50.81%    50.5%   -0.32%     
+ Complexity    24173    22789    -1384     
============================================
  Files          2271     2271              
  Lines        229906   225079    -4827     
  Branches      25005    24887     -118     
============================================
- Hits         116835   113670    -3165     
+ Misses       104440   103669     -771     
+ Partials       8631     7740     -891

Impacted Files	Coverage Δ	Complexity Δ
...m/google/cloud/vision/v1/ImageAnnotatorClient.java	58.69% <0%> (-3.31%)	15% <0%> (-4%)
...e/cloud/vision/v1p4beta1/ImageAnnotatorClient.java	58.69% <0%> (-3.31%)	15% <0%> (-4%)
...e/cloud/vision/v1p3beta1/ImageAnnotatorClient.java	47.05% <0%> (-2.95%)	9% <0%> (-2%)
...e/cloud/vision/v1p2beta1/ImageAnnotatorClient.java	47.05% <0%> (-2.95%)	9% <0%> (-2%)
.../java/com/google/cloud/speech/v1/SpeechClient.java	48.57% <0%> (-2.78%)	10% <0%> (-2%)
...om/google/cloud/speech/v1p1beta1/SpeechClient.java	48.57% <0%> (-2.78%)	10% <0%> (-2%)
...d/webrisk/v1beta1/WebRiskServiceV1Beta1Client.java	63.41% <0%> (-2.5%)	12% <0%> (-3%)
...ogle/cloud/texttospeech/v1/TextToSpeechClient.java	55.88% <0%> (-2.46%)	9% <0%> (-2%)
...cloud/texttospeech/v1beta1/TextToSpeechClient.java	55.88% <0%> (-2.46%)	9% <0%> (-2%)
...oogle/cloud/language/v1/LanguageServiceClient.java	79.16% <0%> (-2.32%)	26% <0%> (-9%)
... and 536 more

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