[configlet] hangman: missing test cases

[github-actions]

Missing test cases for hangman

Part of #2959.

The following test cases from problem-specifications are not yet implemented in this track:

• 2419ffe6-16d8-4059-856a-9a101998a418 Initially 9 failures are allowed and no letters are guessed
• 17c4296d-daab-44dc-8155-37c77caa52c1 After 10 failures the game is over
• 77c9ae1f-bbc4-4ed4-b67e-08110cbcfc17 Losing with several correct guesses
• 25101d8d-9874-405b-9825-193a14b69753 Feeding a correct letter removes underscores
• 8e6bd521-bc9b-458f-9cce-f57f4140c173 Feeding a correct letter twice counts as a failure
• 5e6971b7-5e5f-49c2-b85d-1dd6aeb53bd5 Guessing a repeated letter reveals all instances
• a6c69d92-01ef-4b81-b9d9-801131e79bbb Getting all the letters right makes for a win
• 2dc47994-b434-4a26-b70c-1eebeff77fe4 Winning on the last guess is still a win
• 52801d56-6963-494b-a901-5736e46ddc12 Guessing after a lose is error
• 29a874f3-a413-4e1b-9a60-6be018e70b60 Guessing after a win is error

How to help

For detailed instructions on how to fetch configlet and update the tests, please see the "How to do this task" section in the main tracking issue:
👉 Read the instructions here

This issue is managed automatically by the Create Configlet Sync Issues workflow.

[kahgoh]

Notes:

• This exercise has been deprecated in the problem spec and replaced by the save-the-cow exercise.
• @thibault2705 currently has a PR open on this