test(scheduler/persistentcache): add uint test for host manager

[gaius-qi]

Description

This pull request includes changes to the scheduler/resource/persistentcache package to ensure that time intervals are stored in nanoseconds. The most important changes include updates to the Store methods in the hostManager, peerManager, and taskManager to convert time intervals to nanoseconds.

Time interval conversion to nanoseconds:

• scheduler/resource/persistentcache/host_manager.go: Modified the Store method to convert announce_interval to nanoseconds.
• scheduler/resource/persistentcache/peer_manager.go: Modified the Store method to convert cost to nanoseconds.
• scheduler/resource/persistentcache/task_manager.go: Modified the Store method to convert ttl to nanoseconds.

Related Issue

Motivation and Context

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation Update (if none of the other choices apply)

Checklist

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 2 lines in your changes missing coverage. Please review.

Project coverage is 34.96%. Comparing base (2b75f86) to head (09b21b7).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
scheduler/resource/persistentcache/peer_manager.go	0.00%	1 Missing ⚠️
scheduler/resource/persistentcache/task_manager.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3812      +/-   ##
==========================================
+ Coverage   34.28%   34.96%   +0.67%     
==========================================
  Files         337      337              
  Lines       38986    38986              
==========================================
+ Hits        13365    13630     +265     
+ Misses      24776    24460     -316     
- Partials      845      896      +51     

Flag	Coverage Δ
unittests	34.96% <33.33%> (+0.67%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
scheduler/resource/persistentcache/host_manager.go	57.56% <100.00%> (+57.56%)	⬆️
scheduler/resource/persistentcache/peer_manager.go	0.00% <0.00%> (ø)
scheduler/resource/persistentcache/task_manager.go	0.00% <0.00%> (ø)

... and 4 files with indirect coverage changes

[chlins]

lgtm