fix(gc): increase download task timeout from 2 hours to 24 hours

[gaius-qi]

Description

This pull request makes a single, straightforward change to the garbage collection behavior in the dragonfly-client codebase. The timeout for download tasks before they are considered for garbage collection has been increased from 2 hours to 24 hours.

• Increased the DOWNLOAD_TASK_TIMEOUT constant in gc/mod.rs from 2 hours to 24 hours, allowing download tasks to persist longer before being garbage collected.

Related Issue

Fixes #1815

Motivation and Context

Screenshots (if appropriate)

[EvanCley]

LGTM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 43.53%. Comparing base (7ecfcf3) to head (9bd2411).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1816      +/-   ##
==========================================
+ Coverage   43.40%   43.53%   +0.12%     
==========================================
  Files          92       92              
  Lines       26997    26917      -80     
==========================================
  Hits        11719    11719              
+ Misses      15278    15198      -80     

Files with missing lines	Coverage Δ
dragonfly-client/src/gc/mod.rs	0.00% <ø> (ø)

... and 3 files with indirect coverage changes

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