New Check: helper/resource.TestStep Should Omit PreConfig With Empty Function

[bflad]

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Description

Declaring a TestStep with an empty PreConfig function is extraneous and can be confusing for those not familiar with the acceptance testing framework.

New Check

• AT###

Flagged Provider Code

resource.TestStep{
  // ... other configuration ...
  PreConfig: func() {},
}

Passing Provider Code

resource.TestStep{
  // ... other configuration ...
}