remove redundant changelog entries

changelogs/unreleased/33303-404-for-unauthorized-project.yml

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-title: Renders 404 if given project is not readable by the user on Todos dashboard
-merge_request:
-author:

changelogs/unreleased/33359-pers-snippet-files-location.yml

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-title: Use uploads/system directory for personal snippets
-merge_request:
-author:

changelogs/unreleased/bvl-remove-appearance-symlink.yml

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-title: Remove uploads/appearance symlink. A leftover from a previous migration.
-merge_request:
-author: