fix: keep idle validation on native timers

[mcollina]

Summary

• backport fix: keep idle validation on native timers #5397 to v7.x
• use native timers for idle socket validation
• make the response queue poisoning regression test wait for disconnect

Tests

• node --test test/interceptors/cache.js 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 92.88%. Comparing base (b0ba52d) to head (99f3c7a).
⚠️ Report is 1 commits behind head on v7.x.

Additional details and impacted files

@@            Coverage Diff             @@
##             v7.x    #5402      +/-   ##
==========================================
- Coverage   92.89%   92.88%   -0.02%     
==========================================
  Files         112      112              
  Lines       35843    35912      +69     
==========================================
+ Hits        33298    33357      +59     
- Misses       2545     2555      +10     

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