Extract budget form to a component

This way it will be easier to change it and reuse it.

spec/components/admin/budgets/form_component_spec.rb

@@ -0,0 +1,16 @@
+require "rails_helper"
+
+describe Admin::Budgets::FormComponent, type: :component do
+  describe "#voting_styles_select_options" do
+    it "provides vote kinds" do
+      types = [
+        ["Knapsack", "knapsack"],
+        ["Approval", "approval"]
+      ]
+
+      component = Admin::Budgets::FormComponent.new(double)
+
+      expect(component.voting_styles_select_options).to eq(types)
+    end
+  end
+end