fix: keep idle validation on global timers

[mcollina]

Summary

• restore idle socket validation to use the normal global timer APIs instead of bypassing fake timers through node:timers
• update cache interceptor tests to fake only Date, which is the only clock behavior they need to control
• keep the poisoned idle socket test synchronization from fix: keep idle validation on native timers #5397

Tests

• node --test test/interceptors/cache.js
• node --test test/response-queue-poisoning.js test/issue-810.js
• npm run lint -- --quiet

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.24%. Comparing base (b4c287b) to head (9290322).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5407      +/-   ##
==========================================
- Coverage   93.25%   93.24%   -0.01%     
==========================================
  Files         110      110              
  Lines       36826    36825       -1     
==========================================
- Hits        34341    34337       -4     
- Misses       2485     2488       +3     

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