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releasenotes: extract helper for checking for incompatible arguments

Authored by martinvonz.

Description

releasenotes: extract helper for checking for incompatible arguments

This patch extracts a new check_incompatible_arguments() function
similar to check_at_most_one_arg(). The difference is that the new
function is for checking for arguments that are disallowed together
with some other argument but not mutually exclusive among themselves.

Differential Revision: https://phab.mercurial-scm.org/D7639

Details