Extract OTel-based span data inference from `captureSpan`

[Lms24]

We added span name inference for OTel-based spans directly into the captureSpan pipeline. This is a bit suboptimal because it increases browser bundle size that also uses captureSpan despite these spans never going through a browser SDK.

Instead, we can use the client.on('processSpan') hook in the Sentry SpanProcessor to use the already existing parseSpanDescription logic from @sentry/opentelementry.

[linear-code]

JS-2807