[BugFix] Prevent exporting duplicate OpenTelemetry spans

[ronensc]

After merging #7049, I noticed that non-beam search requests result in duplicate OpenTelemetry spans being exported.

This PR resolves the issue by passing the finished_before list to do_tracing(), similar to its use in do_log_stats().

cc @megha95

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[ronensc]

Should I also pass the skip list in addition to finished_before, and exclude the sequence groups marked in this list during tracing?