chore: switch Suite from util.inherits to ES2015 classes

[JoshuaKGoldberg]

PR Checklist

• Addresses an existing open issue: part of 🐛 Bug: remove util.inherits / convert to classes #5025
• That issue was marked as status: accepting prs
• Steps in CONTRIBUTING.md were taken

Overview

Switches Suite from the old util.extends to the snazzy new ES2015 class syntax. Very modern.

🤎

[coveralls]

coverage: 94.314% (-0.04%) from 94.357%
when pulling 67104ab on JoshuaKGoldberg:inherits-to-class-suite
into 579e047 on mochajs:main.

[JoshuaKGoldberg]

Closing for now since #5025 is blocked on us being ready for a next major version. We can reopen later.

[JoshuaKGoldberg]

Reopening now that we're working on v12 (#5357).

[codecov]

Codecov Report

❌ Patch coverage is 98.68996% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 88.44%. Comparing base (15fb31a) to head (4185363).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/suite.js	98.68%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5179      +/-   ##
==========================================
- Coverage   88.44%   88.44%   -0.01%     
==========================================
  Files          66       66              
  Lines        4794     4793       -1     
  Branches      978      978              
==========================================
- Hits         4240     4239       -1     
  Misses        554      554              

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[mark-wiemer]

Noice