test: migrate console_assert message test to snapshot

[galaxy4276]

Summary

Migrates test/message/console_assert from the legacy Python-based test runner (testcfg.py + .out file) to the modern JS snapshot approach.

Changes

• Add test/fixtures/console/console_assert.js — the fixture script
  (same logic as the old test/message/console_assert.js, with the
  require path adjusted for the new location)
• Add test/fixtures/console/console_assert.snapshot — expected output
• Add console/console_assert.js entry to test-node-output-console.mjs
• Remove test/message/console_assert.js and test/message/console_assert.out

What the test verifies

console.assert(false, Symbol('hello')) should print
Assertion failed Symbol(hello) to stderr without throwing or exiting.
The snapshot captures this expected output.

Refs: #47707

Test plan

• node --test test/parallel/test-node-output-console.mjs passes
• No other test/message/ tests affected

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.69%. Comparing base (31b9e60) to head (de85e12).
⚠️ Report is 51 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #62801      +/-   ##
==========================================
- Coverage   89.70%   89.69%   -0.01%     
==========================================
  Files         706      706              
  Lines      218288   218288              
  Branches    41782    41780       -2     
==========================================
- Hits       195806   195796      -10     
+ Misses      14394    14392       -2     
- Partials     8088     8100      +12     

see 24 files with indirect coverage changes

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