fix(yarn-plugin-tools): preserve hook final newline

[TorinAsakura]

Таска

• Close [Bug] Preserve trailing newline in generated package manifests #703

Как проверять

До фикса

1. Context: standard Raijin install hook generation in a clean repository.
   Action: run yarn install.
   Expected result: tracked Husky hook files can be rewritten without a final newline; .config/husky/pre-commit showed No newline at end of file in git diff.

После фикса

1. Context: standard Raijin install hook generation after rebuilding the bundled CLI.
   Action: run yarn install.
   Expected result: generated Husky hook files end with 0a, and .config/husky/pre-commit no longer remains dirty after install.

Пруфы

• yarn test unit current-yarn-executable --test-reporter=tap
• yarn typecheck yarn/plugin-tools/sources/hooks/after-all-installed.hook.ts yarn/plugin-tools/sources/current-yarn-executable.test.ts
• yarn lint yarn/plugin-tools/sources/hooks/after-all-installed.hook.ts yarn/plugin-tools/sources/current-yarn-executable.test.ts
• yarn workspace @atls/yarn-plugin-tools build
• yarn workspace @atls/yarn-cli build
• cmp -s yarn/cli/dist/yarn.mjs .yarn/releases/yarn.mjs
• yarn install
• yarn check
• yarn raijin:check

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