Added a switch for using cached local db in test to improve speed

[billielynch]

regarding : #741

As discussed with google team, moving to using cached local db when not running acceptance tests.

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[G-Rath]

awesome stuff!

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 59.76%. Comparing base (aa771d2) to head (f33a77d).

Files	Patch %	Lines
internal/testutility/utility.go	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #826      +/-   ##
==========================================
- Coverage   59.78%   59.76%   -0.02%     
==========================================
  Files         136      136              
  Lines       11266    11268       +2     
==========================================
- Hits         6735     6734       -1     
- Misses       4102     4104       +2     
- Partials      429      430       +1     

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[another-rex]

LGTM, thanks!