Basic Portfolio Views (#1000)

* Add holdings tab to account view

* Basic portfolio UI

* Cleanup

* Handle missing holding data

* Remove synced at (implemented in separate pr)

* translations

* Tweak post sync streams

* Remove stale methods from merge conflict

test/controllers/account/holdings_controller_test.rb

@@ -0,0 +1,20 @@
+require "test_helper"
+
+class Account::HoldingsControllerTest < ActionDispatch::IntegrationTest
+  setup do
+    sign_in users(:family_admin)
+    @account = accounts(:investment)
+    @holding = @account.holdings.current.first
+  end
+
+  test "gets holdings" do
+    get account_holdings_url(@account)
+    assert_response :success
+  end
+
+  test "gets holding" do
+    get account_holding_path(@account, @holding)
+
+    assert_response :success
+  end
+end