feat(unicorn): add prefer-array-last-methods rule

[HashemKhalifa]

Motivation

Refs #1309. Port unicorn/prefer-array-last-methods from eslint-plugin-unicorn v75.0.0.

Implementation and tests

• Native suggestion-only rule, complete Go upstream/docs/extras suites, and JS upstream mirror.
• Tests-first checkpoint: 2f6c5c42.
• The JS mirror applies the actual returned suggestion edits for all upstream invalid cases and compares exact messages and resulting source. It also verifies the absence of autofixes and the absence of suggestions for comment-guarded cases. These are executable checks, not suggestion fields ignored by the shared RuleTester.
• Native registration and enablement in packages/rslint/src/config/presets/unicorn.ts; presets.test.ts is untouched.

Verification

• Focused Go suite: passed; rule-package statement coverage: 100.0%.
• Fresh focused native production build and core JS build: passed. Temporary native catalogs and test-runner configuration were restored byte-for-byte. Optional rule-option declaration generation was skipped because no schema dump was present.
• Five selected JS integration files: 5 files / 13 groups passed; this file includes a real suggestion-output assertion group.
• Deliberately corrupting an expected suggestion output fails the new runtime assertion; the mutation was restored.
• Changed-file formatting and git diff --check: passed. The repository spelling command excludes these upstream fixture files.

Upstream GitHub Actions remains at action_required on the current head; these are local focused validation results, not a claim of green upstream CI.