Install error results in inconsistent state

[ofalvai]

When installing a Flutter version without the xz binary available, it results in an installation failure, but the requested version is also registered as if the installation was successful:

root@337d2c0a2675:~# asdf install flutter 3.16.2-stable
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  626M  100  626M    0     0  30.8M      0  0:00:20  0:00:20 --:--:-- 33.1M
tar (child): xz: Cannot exec: No such file or directory
tar (child): Error is not recoverable: exiting now
tar: Child returned status 2
tar: Error is not recoverable: exiting now

root@337d2c0a2675:~# asdf list flutter
  3
 *3.16
  3.16.1
  3.16.1-stable
  3.16.2-stable