fix(nushell): test use not source, fix pipeline parse error
#7013
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| parse env | update-envfor deactivation operations #6994 ) made the incorrect assumption that the output ofmise activate nuwill besourced from a nushell configuration, but our documentation specifically says it should beused instead ( https://mise.jdx.dev/installing-mise.html#nushell )export-env { ... }block to fix the parser errors