Count only the investments visible and assigned to current valuator

It has more sense to show the count of the investments the
valuator is going to find in the investments valuation page.

spec/components/valuation/budgets/row_component_spec.rb

@@ -0,0 +1,27 @@
+require "rails_helper"
+
+describe Valuation::Budgets::RowComponent do
+  let(:valuator) { create(:valuator) }
+
+  before { sign_in(valuator.user) }
+
+  it "Displays visible and assigned investments count when budget is in valuating phase" do
+    budget = create(:budget, :valuating, name: "Sports")
+    create(:budget_investment, :visible_to_valuators, budget: budget, valuators: [valuator])
+    create(:budget_investment, :invisible_to_valuators, budget: budget, valuators: [valuator])
+    create(:budget_investment, :visible_to_valuators, budget: budget)
+
+    render_inline Valuation::Budgets::RowComponent.new(budget: budget)
+
+    expect(page).to have_selector(".investments-count", text: "1")
+  end
+
+  it "Displays zero as investments count when budget is not in valuating phase" do
+    budget = create(:budget, %i[accepting finished].sample, name: "Sports")
+    create(:budget_investment, :visible_to_valuators, budget: budget, valuators: [valuator])
+
+    render_inline Valuation::Budgets::RowComponent.new(budget: budget)
+
+    expect(page).to have_selector(".investments-count", text: "0")
+  end
+end