Annotating Tests w/ Translation Errors

There are several tests that currently do not translate (intentionally or unintentionally).

• Some tests, like CqlTypesTest.Time.TimeUpperBoundHours, are marked with invalid="semantic" and an XML comment with the translation error.
• Other tests, like CqlDateTimeOperatorsTest.Uncertainty tests.TimeDurationBetweenHourDiffPrecision, are marked with invalid="true" and an XML comment with the translation error.
• Still other tests, like CqlIntervalOperatorsTest.Expand.ExpandPer1, do not populate the invalid parameter at all but do have an XML comment with the translation error.

I think it would be good to have some consistency here so that implementations of this testing framework know how to handle these. Ideally, implementations shouldn't need to process and parse XML comments to know that a translation error is expected. While using invalid="true" helps some, it is still problematic since it is used for both translation errors and run-time errors.