Truncate check HTTP check output if too long

### Feature Description

I'd like the output from HTTP checks to be truncated if it's too long. Either automatically or via configuration option that specifies number of lines/characters for example.

#### Use Case(s)

Many services don't provide a sensible health check endpoint, which often results in having to use `/` or `/index.html` as check, but that can often result in a massive HTML response that makes the Consul UI for checks harder to navigate due to the size.