Add aria-labels to user investment actions

This way it'll be easier for people using screen readers to know which
link/button they're about to click.

Note that, at least for now, we aren't reusing the code en
`Admin::ActionComponent`. We might do so in the future if we implement
similar code in more parts of the public area.

spec/components/users/budget_investment_table_actions_component_spec.rb

@@ -0,0 +1,31 @@
+require "rails_helper"
+
+describe Users::BudgetInvestmentTableActionsComponent do
+  let(:user) { create(:user, :level_two) }
+  let(:budget) { create(:budget, :accepting) }
+  let(:investment) { create(:budget_investment, budget: budget, author: user, title: "User investment") }
+
+  describe "#edit_link" do
+    it "generates an aria-label attribute" do
+      sign_in(user)
+
+      render_inline Users::BudgetInvestmentTableActionsComponent.new(investment)
+
+      expect(page).to have_link count: 1
+      expect(page).to have_link "Edit"
+      expect(page).to have_css "a[aria-label='Edit User investment']"
+    end
+  end
+
+  describe "#destroy_button" do
+    it "generates an aria-label attribute" do
+      sign_in(user)
+
+      render_inline Users::BudgetInvestmentTableActionsComponent.new(investment)
+
+      expect(page).to have_button count: 1
+      expect(page).to have_button "Delete"
+      expect(page).to have_css "button[aria-label='Delete User investment']"
+    end
+  end
+end