test(membership-fees): share create_fee_type and create_cycle fixtures

Replace the create_fee_type/create_cycle helpers duplicated across 18/8
membership-fee test files with a single shared definition in Mv.Fixtures,
reconciling the divergent local signatures (including the reversed
argument order) into one superset so behavior is unchanged.

test/mv/statistics_test.exs

@@ -6,11 +6,11 @@ defmodule Mv.StatisticsTest do
 
   require Ash.Query
   import Ash.Expr
+  import Mv.Fixtures, only: [create_fee_type: 2]
 
   alias Mv.Membership.Member
   alias Mv.MembershipFees
   alias Mv.MembershipFees.MembershipFeeCycle
-  alias Mv.MembershipFees.MembershipFeeType
   alias Mv.Statistics
 
   setup do
@@ -18,22 +18,6 @@ defmodule Mv.StatisticsTest do
     %{actor: actor}
   end
 
-  defp create_fee_type(actor, attrs) do
-    MembershipFeeType
-    |> Ash.Changeset.for_create(
-      :create,
-      Map.merge(
-        %{
-          name: "Test Fee #{System.unique_integer([:positive])}",
-          amount: Decimal.new("50.00"),
-          interval: :yearly
-        },
-        attrs
-      )
-    )
-    |> Ash.create!(actor: actor)
-  end
-
   describe "first_join_year/1" do
     test "returns the year of the earliest join_date", %{actor: actor} do
       Mv.Fixtures.member_fixture(%{join_date: ~D[2019-03-15]})
@@ -131,7 +115,7 @@ defmodule Mv.StatisticsTest do
     end
 
     test "returns totals by status for cycles in that year", %{actor: actor} do
-      fee_type = create_fee_type(actor, %{amount: Decimal.new("50.00")})
+      fee_type = create_fee_type(%{amount: Decimal.new("50.00")}, actor)
 
       # Creating members with fee type triggers cycle generation (2020..today). We use 2024 cycles.
       _member1 =
@@ -171,8 +155,8 @@ defmodule Mv.StatisticsTest do
     test "when fee_type_id is passed in opts, returns only cycles of that fee type", %{
       actor: actor
     } do
-      fee_type_a = create_fee_type(actor, %{amount: Decimal.new("30.00")})
-      fee_type_b = create_fee_type(actor, %{amount: Decimal.new("70.00")})
+      fee_type_a = create_fee_type(%{amount: Decimal.new("30.00")}, actor)
+      fee_type_b = create_fee_type(%{amount: Decimal.new("70.00")}, actor)
 
       _m1 =
         Mv.Fixtures.member_fixture(%{
@@ -207,7 +191,7 @@ defmodule Mv.StatisticsTest do
     end
 
     test "returns sum of amount for all unpaid cycles", %{actor: actor} do
-      fee_type = create_fee_type(actor, %{amount: Decimal.new("50.00")})
+      fee_type = create_fee_type(%{amount: Decimal.new("50.00")}, actor)
 
       _member =
         Mv.Fixtures.member_fixture(%{