substitute: Rethrow with 'raise-exception', not 'throw'.

Rethrowing with 'throw' doesn't work as intended when the exception
being rethrown is a SRFI-34 exception.

Fixes <https://issues.guix.gnu.org/55820>.

* guix/scripts/substitute.scm (kind-and-args-exception?): New variable.
(call-with-cached-connection): Rewrite using 'guard' instead of 'catch'
and 'raise' instead of 'throw'.
(system-error?): Use 'kind-and-args-exception?' instead of local
definition.

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