refactor: rename get_persistent_tasks to `get_persistent_cache_tasks

[gaius-qi]

Description

This pull request makes a small but important fix to the PersistentCacheTask implementation, correcting a method call to ensure the correct retrieval of persistent cache tasks from local storage.

• Changed the method call from get_persistent_tasks() to get_persistent_cache_tasks() in the list_local function to accurately fetch persistent cache tasks from local storage.

Related Issue

Fixes #1793

Motivation and Context

Screenshots (if appropriate)

[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.21%. Comparing base (f54846b) to head (1a38a69).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...onfly-client/src/resource/persistent_cache_task.rs	0.00%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1795   +/-   ##
=======================================
  Coverage   43.21%   43.21%           
=======================================
  Files          92       92           
  Lines       26868    26868           
=======================================
  Hits        11612    11612           
  Misses      15256    15256           

Files with missing lines	Coverage Δ
...onfly-client/src/resource/persistent_cache_task.rs	0.00% <0.00%> (ø)

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[BraveY]

LGTM