fix(supported-version): filter uninstallable versions from usable kind

[rhoerr]

Summary

• Exclude Magento 2.4.2 through 2.4.3-p3 from the usable kind: their composer-root-update-plugin ~1.1 requires composer/composer <=2.1, and all Composer versions <=2.1 are insecure
• Exclude Mage-OS 2.2.1: uninstallable due to a webonyx/graphql-php security advisory
• Add tests covering both exclusion sets

Fixes failures in: https://github.com/mage-os/generate-mirror-repo-js/actions/runs/24401336256

Build output

> npx esbuild --outfile=dist/index.js --platform=node --bundle --minify src/index.ts

  dist/index.js  491.5kb

⚡ Done in 12ms

Test output

PASS src/kind/get-usable.spec.ts
  getUsableVersions for magento-open-source
    ✓ should return an array of versions
    ✓ should filter out versions with composer < 2.0.0
    ✓ should handle composer version equal to 2.0.0
    ✓ should handle numeric composer versions
    ✓ should filter out uninstallable Magento 2.4.2.x and 2.4.3.x versions
  getUsableVersions for mage-os
    ✓ should filter out mage-os 2.2.1 due to security advisory

PASS src/matrix/get-matrix-for-kind.spec.ts (21 tests)
PASS src/kind/get-currently-supported.spec.ts (29 tests)
PASS src/versions/get-versions-for-project.spec.ts (4 tests)
PASS src/kind/validate-kinds.spec.ts (4 tests)
PASS src/project/validate-projects.spec.ts (2 tests)
PASS src/project/validations/is-known-project.spec.ts (2 tests)
PASS src/nightly/amend-matrix-for-next.spec.ts (4 tests)
PASS src/nightly/unify-next-package-name.spec.ts (5 tests)
PASS src/nightly/get-next-version.spec.ts (3 tests)

Test Suites: 10 passed, 10 total
Tests:       74 passed, 74 total

Test plan

• All 74 unit tests pass (including 2 new tests for the exclusions)
• Build succeeds
• Verify excluded versions no longer appear in usable matrix output

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