Adjust object.* span names to follow sentry-convention rules #25568

getsentry/sentry-conventions#707 adds span name and description rules for object.* spans. Unfortunately, I missed them when working on the span name/description changesfor v11. We currently emit them for Cloudflare R2 but with names that slightly differ what conventions would expect. The suggestions in conventions look a bit nicer, so I suggest we adjust ours to them.