net: multiple dtls improvements

[jasnell]

Multiple DTLS improvements.

Signed-off-by: James M Snell jasnell@gmail.com
Assisted-by: Claude/Opus

[nodejs-github-bot]

Review requested:

• @nodejs/security-wg

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/74632/

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.25%. Comparing base (d7aca7e) to head (d7ecfc4).
⚠️ Report is 15 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #64314      +/-   ##
==========================================
- Coverage   92.05%   90.25%   -1.80%     
==========================================
  Files         381      741     +360     
  Lines      169394   240795   +71401     
  Branches    25970    45350   +19380     
==========================================
+ Hits       155935   217340   +61405     
- Misses      13169    15045    +1876     
- Partials      290     8410    +8120     

Files with missing lines	Coverage Δ
lib/internal/dtls/dtls.js	100.00% <100.00%> (ø)

... and 486 files with indirect coverage changes

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