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rebase: use cmdutil.check_at_most_one_arg() for --confirm/--dry-run

Authored by martinvonz.

Description

rebase: use cmdutil.check_at_most_one_arg() for --confirm/--dry-run

I've also updated the helper to work with the hyphenated --dry-run
option.

Differential Revision: https://phab.mercurial-scm.org/D7641