OLYMPIA — House Democrats on Monday released a two-year budget plan that proposes $3 billion in additional revenue — including a tax increase on some businesses and a new capital gains tax — to address a court mandate on education funding. However, Democrats said while they plan to pass their spending plan on the House floor Friday, they won’t likely take a vote in that chamber on any of the tax bills that pay for it before completing negotiations with Senate Republicans, who passed their own budget plan last week. The House proposal was to receive a public hearing on Monday afternoon, and was expected to be voted out of committee Tuesday.