[AIReview | js_array-method-sort]: Add .reviewrelatedfiles and checklist.md

[Vasya564]

Summary

AI reviewer hallucinates requirements on PRs here because it doesn't see src/arrayMethodSort.test.js. The test file only covers sort2, but the reviewer assumes students must also override Array.prototype.sort.

• Add .reviewrelatedfiles with src/**/* — same pattern used by 17 other repos (e.g. js_get_coin_combination, js_split_integer). AIReview service picks up files matching these globs and sends them as extra LLM context.
• Add checklist.md with task-specific items so the reviewer cites real checklist numbers instead of inventing them.

PF-13709

[mateacademy-ai-mentor]

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_{[CODE: NFR]}

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Ignored files list:

• .reviewrelatedfiles
• checklist.md

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