Update error patterns

[swernli]

This change updates the error patterns in the compiler to favor only using labels with strings that add more information to the top level error message and make sense when concatenated. It also updates the qsc_wasm error translation to use the label message and help text if present.

[swernli]

The question came up in further discussion having a more specific convention in the error messages. Specifically, treat the top-level message (the thing in #[error("TEXT")]) as the place to put all relevant information, and treat any other label text or help text as purely additive/assistive. In contrast, there are still places even with this change where the top-level message plus the first span message are needed to fully interpret the error. I think the former convention is helpful, because not every consumer/environment is going to have a place to concatenate messages (or know that it should). I'll update these messages to follow the convention and see how they look, then I could use a text review from folks to make sure they all make sense.