Introduce board multi select feature flag [RUN ALL RSPEC] [RUN AS-IF-FOSS]

Merged Eulyeon Ko requested to merge introduce-board-multi-select-feature-flag into master

What does this MR do?

The refactored boards, which will roll out in this milestone, doesn't support multi select drag&drop.

Users will get confused when they can multi select issue cards but cannot use drag&drop so we decided to temporarily disable multi select by putting it behind a feature flag.

For more context, please see #289797

The new version of boards uses Draggable to drag and drop an issue.

Once Draggable supports multi drag (, it should be added to GraphQL boards.

Does this MR meet the acceptance criteria?


Edited by Eulyeon Ko

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