test: remove obsolete nodeMajor/nodeMinor util exports

[trivikr]

This relates to...

N/A

Rationale

Undici now supports Node.js >=22.19.0, so the exported nodeMajor/nodeMinor helpers are obsolete. The only remaining usage was a test-only branch for old console.table formatting behavior.

Changes

• Remove nodeMajor and nodeMinor from lib/core/util.js
• Simplify test/mock-interceptor-unused-assertions.js to assume the Node 22+ console.table layout
• Drop the now-unused util import and version-gated snapshot branches from that test

Features

N/A

Bug Fixes

N/A

Breaking Changes and Deprecations

N/A

Status

• I have read and agreed to the Developer's Certificate of Origin
• Tested
• Benchmarked (optional)
• Documented
• Review ready
• In review
• Merge ready

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.94%. Comparing base (ad6b0c6) to head (d40e218).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4976      +/-   ##
==========================================
- Coverage   92.94%   92.94%   -0.01%     
==========================================
  Files         110      110              
  Lines       35771    35767       -4     
==========================================
- Hits        33248    33244       -4     
  Misses       2523     2523              

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[mcollina]

lgtm