`CodeCompletioString::getName()` was used only as the sorting keys in
`CodeCompletionContext::sortCompletionResults()` which is effectively
deprecated. There's no reason to check them in `swift-ide-test`. Instead,
check `printCodeCompletionResultFilterName()` that is actually used for
filtering.
The tests were matching the previous implementation's output, which sometimes produced 'unknown' and sometimes 'unrelated' in cases where there was no expected type from the context.
