Resolve "Opening participations dialog in coursebook still does additionial GraphQL queries"

Closes #334 (closed)

added part::frontend source::customer::kath type::bug labels

added 2 commits

• de2c136d - Pass preloaded extraMarks to buttons component
• e11ddccc - Respect preloaded data

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marked this merge request as ready

assigned to @hansegucker

mentioned in commit a1aedec2

merged