Load board lists with GraphQL (feature flag disabled)

What does this MR do?

• Use GraphQL endpoint to get the lists for an issue board.
• Added behind the graphql_board_lists feature flag
• Store query result in boards_store methods still, as that is being replaced separately

FE for #36758 (closed)

Does this MR meet the acceptance criteria?

Conformity

• Code review guidelines
• Merge request performance guidelines