test(linter/plugins): add script for investigating failing conformance test cases

[overlookmotel]

Add a script for testing failing conformance test cases. This is what I've been using to get Claude to diagnose the cause of test failures. I thought it'd be useful to commit it, so others can use it too if bug reports arise, or they want to tackle some of the remaining problems.

[overlookmotel]

• test(linter/plugins): add script for investigating failing conformance test cases #17296 👈 (View in Graphite)
• fix(linter/plugins): set up global scope correctly #17293
• refactor(linter/plugins): add environments definitions #17292
• feat(linter/plugins): pass env from Rust to JS #17291
• refactor(linter/plugins): rename var in RuleTester #17290
• main

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[overlookmotel]

@camc314 I think this stack is ready to merge, but it looks like CodSpeed have broken us somehow. Can I please leave it to you to merge once the CodSpeed problem is solved?

[Copilot]

Pull request overview

This PR adds a debugging script (tester.ts) to help investigate failing conformance test cases by running them with both ESLint and Oxlint side-by-side. The script is designed to be used interactively, allowing developers to add console logging to ESLint rule implementations to understand differences in behavior.

Key Changes:

• Adds a new standalone testing script that runs individual test cases through both ESLint's and Oxlint's RuleTester implementations
• Includes detailed inline documentation/instructions for how to use the script, targeted at AI assistants helping with debugging
• Sets up simple pass-through describe/it functions to bypass the conformance test framework's capture mechanism

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