Sync palindrome-products

[mk-mxp]

• Run bin/configlet sync -u -e palindrome-products --yes --docs --filepaths --metadata --tests include (updates the Markdown files and maybe tests.toml)
  • docs: instructions unsynced: palindrome-products
• Drop strict types comments from test file and example code (these are useless)
• Add and sync test meta data to tests (uuid in DocBlocks / #TestDox())
• Add exercise to bin/auto-sync.txt to keep it in sync (keep the file alphabetically sorted)
• Decide on adding / adjusting / ordering test cases to match current problem specs
  • palindrome-products: missing 1 test case

Do not redesign the student's interface or add test cases that would invalidate existing community solutions. These are extra tasks, which should be discussed in advance.