Import suggestion timeout leads to flaky tests

[smarter]

I just saw this on the CI:

Cancelling test of (math.Integral.Implicits.infixIntegralOps : [T](x: T)(implicit num: Integral[T]): Integral[T]#IntegralOps) when making suggestions for error in tests/neg/i6242.scala
Wrong number of errors encountered when compiling out/compileNeg/neg/i6242, expected: 2, actual: 1

Import suggestions being cancelled should not change the errors being reported, otherwise all neg tests are potentially flaky.