Some GPG options work only with private keys but our completions suggest all
keys. Modify `__fish_complete_gpg_user_id and __fish_complete_gpg_key_id`
to take an optional argument for the "key type" to override `--list-keys`
with like `--list-secret-keys` for the appropriate options.
Closes#8712
Revert "gut gpg.fish/gpg1.fish/gpg2.fish; migrate functionality to __fish_complete_gpg.fish"
This reverts commit d558218d03.
Revert "break version-specific completions out into independent function;"
This reverts commit 9160e77b01.
Revert "split gpg2- and gpg1-specific completions to conditional block"
This reverts commit a069b95f63.