use pegasus_unittest database for shared & pegasus unit tests during DTT

[davidsbailey]

No description provided.

[davidsbailey]

@wjordan , this is passing drone now, and passes locally when I manually modify test.yml.erb to unconditionally run the clear_secrets block and then run RAILS_ENV=test RACK_ENV=test rake test:shared_ci. Please take a look

[uponthesun]

TestRunUtils.run_pegasus_tests?

[codecov-io]

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@@            Coverage Diff             @@
##             staging   #30181   +/-   ##
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  Coverage           ?   73.07%           
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  Files              ?     2045           
  Lines              ?   112169           
  Branches           ?     3409           
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  Hits               ?    81969           
  Misses             ?    26956           
  Partials           ?     3244

Flag	Coverage Δ
#integration	55.51% <ø> (?)
#storybook	56.59% <ø> (?)
#unit	58.01% <ø> (?)

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