test(v2/featureflag): test improvements following !485

Luke Hollindarequested to merge
lh-featureflag-timeout-test-mr-follow-up into master

Follow up MR for: !485 (merged)

  • Adds TestStringValueDetails_DefaultTimeoutReturnsDefault, the string equivalent of TestBooleanValueDetails_DefaultTimeoutReturnsDefault, introduced in: !485 (merged)
  • Adjusts slowServerForTimeout to accept an optional timeout. Allowing us to use the helper for all tests requiring a slow server.

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