git completion: Bring needs_command in line with git

git has options that can appear before commands, but not all of
them, and some of them need an argument. This means
`__fish_seen_subcommand_from`  will give too many false-positives, while
`[ (count $cmd) -eq 2 ]` will give too many false-negatives.

Instead go through all arguments and check if they are in that list of
options that can be before a command and skip the argument for them, if
any.

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