feat: display file upload speed and time

[xuang7]

Purpose

This PR enhances the upload experience by displaying real-time speed, elapsed time, and estimated time remaining (ETA) in a compact tag, so users can understand progress at a glance and reference the final upload duratione via tooltip after completion. Closes #3678.

Changes

• dataset.service.ts: add uploadSpeed, totalTime, estimatedTimeRemaining to MultipartUploadProgress; apply smoothing for speed/ETA; cap ETA at 24h; add basic bounds checks.
  • Speed Calculation: The upload speed is calculated using a moving average of the last 5 speed samples, where each sample represents the overall average speed (total bytes / total time).
  • ETA Calculation: The estimated time remaining uses the average speed to calculate remaining time, with a 30% change rate limiter to prevent sudden jumps. When the upload reaches 95% completion, the ETA is capped at 10 seconds for better user experience near completion.
  • Update Throttling: Progress updates are throttled to once per second
• dataset-detail.component.ts/html/scss: render compact status tag <speed> - <time> elapsed, <time> left; apply fixed/min width to time/speed to reduce jitter; update the task row auto-hide duration from 3 seconds to 5 seconds.
• user-dataset-staged-objects-list.component.ts/html: show post-upload duration in the file tooltip (full path + upload time)
• gui/src/app/common/util/format.util.ts: add formatting utilities for time and speed.

Demonstration

Single File:

1file.mov

Speed-limited (throttled):

limited.mov

Multiple Files:

multi.mov

[aglinxinyuan]

LGTM!

[aglinxinyuan]

Had several offline discussions regarding the design; the design in the PR description reflects those discussions.