fix: improved uploading pipeline

[muneebneura]

Fixes a few issues in the upload pipeline that were causing unnecessary slowness and incorrect behaviour when bandwidth limiting was enabled which is enabled by default in daemon.

Features

• Global bandwidth limiter: Replaced per-uploader bandwidth throttling with a shared token-bucket. Previously each concurrent upload enforced the limit independently. The limiter is now shared across all uploaders so the aggregate rate is correctly capped.

Bugfixes

• Removed upload semaphore — it was slowing down uploads by adding unnecessary contention between traces. Files within a trace are already sequential, so the semaphore only blocked other traces from uploading in parallel without any real benefit
• Auth headers and org ID are now fetched in parallel instead of one after the other, reducing latency before each upload starts

Items

• NCP-747

[github-actions]

✅ PR source branch is valid

• Source: fix/uploading-improvements
• Target: develop

[favour-neuraco]

LGTM