http,net: optimize repeated property access

[jbj338033]

Summary

• Cache frequently accessed object properties in local variables to reduce property lookup overhead
• Optimizes HTTP Agent constructor and net.Socket configuration methods

Details

This PR optimizes repeated property access patterns in network-related modules:

HTTP Agent Constructor (lib/_http_agent.js)

• Caches this.options in a local opts variable
• Eliminates 14+ repeated property access chains during Agent instantiation
• HTTP Agents are created frequently for HTTP/HTTPS requests

Socket Configuration Methods (lib/net.js)

• setNoDelay(): Caches this._handle to avoid 2 property lookups
• setKeepAlive(): Caches this._handle to avoid 2 property lookups
• These methods are called during socket setup for every TCP connection

Performance Impact

• Reduces object traversal overhead in hot paths
• Particularly beneficial for applications with high connection volumes
• Follows the same optimization pattern as recent PRs (#59934, #59967)

Test plan

• [x] Existing HTTP/HTTPS tests pass
• [x] Existing net tests pass
• [x] No functional changes, only performance optimizations
• [x] Manually verified Agent creation and socket configuration work correctly

[nodejs-github-bot]

Review requested:

• [ ] @nodejs/http
• [ ] @nodejs/net

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 88.44%. Comparing base (55cd2e5) to head (ca579ec). :warning: Report is 573 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #59968      +/-   ##
==========================================
+ Coverage   88.41%   88.44%   +0.02%     
==========================================
  Files         703      703              
  Lines      207421   207426       +5     
  Branches    39993    40012      +19     
==========================================
+ Hits       183398   183448      +50     
+ Misses      15996    15945      -51     
- Partials     8027     8033       +6     

Files with missing lines	Coverage Δ
lib/_http_agent.js	97.33% <100.00%> (+0.01%)	:arrow_up:
lib/net.js	95.28% <100.00%> (+<0.01%)	:arrow_up:

... and 31 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/69565/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/69567/

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/70391/