Define how to represent upload attempts in storage traces

[coryan]

I was using http.request.resend_count, but that is really for per-request attempts, which is not what we want to use for resumable uploads. Resumable uploads resume multiple times, the new PUT requests for these resumes are (arguably) new requests. Maybe with a different attribute to track "resume attempts".

This is a different http request. Why would we preserve the resend_count?

Originally posted by @dbolduc in #4854