CHANGELOG files should obey .npmignore directives like any other file.
Previously, CHANGELOG files were being unconditionally included in packages,
even when listed in .npmignore, which is inconsistent with npm's behavior.
This change removes the special treatment of CHANGELOG files so they can be
properly ignored when listed in .npmignore.
Fixes#18691
Co-authored-by: Electroid <Electroid@users.noreply.github.com>
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