Remove span status description from Lettuce 5.1 instrumentation

[trask]

Lettuce 5.1 appears to be the only instrumentation in the entire repo that sets span status description.

I think this is ok to do in a minor version bump, but I could also hide it behind database stability opt-in.

Noticed this while reviewing #8422, which shows the sensitive data showing up in otel.status_description (in addition to exception.message).

Related to

• Add "otel.status_description" in WithSpan annotation implementation  #6710 (comment)
• Clarify acceptable values for span status ERROR descriptions opentelemetry-specification#3496

Specifically motivated by open-telemetry/opentelemetry-specification#3496 (comment)

It may be a bit easier to explain to users that there's just one place (exception.message) where this shows up and that users may need to redact exception.message (which will likely be going to log pipeline in the future by default), as opposed to showing up in two places / signals.