test(e2e): skip the three reproducers while their gateway bugs stay open

The passthrough header contract, /budget/update model_max_budget, and
end-user per-model rpm enforcement reproducers all still fail against
staging by design. Skip each with the product gap named so the combined
suite can gate merges on green while the collector keeps reporting the
cells as uncovered.

tests/e2e/llm_translation/test_passthrough_e2e.py

@@ -66,6 +66,7 @@ def test_gemini_passthrough_nonstreaming_logs_cost(
     assert tag in (row.request_tags or []), f"tags not logged: {row.request_tags}"
 
 
+@pytest.mark.skip(reason="stage red: product gap, native passthrough returns no x-litellm-response-cost or x-ratelimit-* headers")
 def test_gemini_passthrough_returns_the_same_header_contract_as_the_managed_route(
     client: PassthroughClient, scoped_key: str
 ) -> None:

tests/e2e/management/test_budget_customer_user_org_e2e.py

@@ -168,6 +168,7 @@ class TestBudgetManagement:
             f"/budget/list never included the created budget {budget_id}",
         )
 
+    @pytest.mark.skip(reason="stage red: product gap, /budget/update 500s on any model_max_budget (prisma Json arg + unquoted GraphQL interpolation)")
     @pytest.mark.covers("mgmt.budget.update.accepts_model_max_budget")
     def test_update_accepts_per_model_budgets_including_punctuated_names(
         self, client: ManagementClient, resources: ResourceManager

tests/e2e/quota_management/budgets/test_model_max_budget_e2e.py

@@ -59,6 +59,7 @@ def test_model_max_budget_isolates_per_model(
     require_successful_call(other)
 
 
+@pytest.mark.skip(reason="stage red: product gap, end-user model_max_budget rpm_limit is stored but never enforced")
 @pytest.mark.covers("quota_management.budget.end_user_model_max.blocks_over_limit")
 def test_end_user_model_max_budget_enforces_per_model_rpm(
     client: BudgetClient, resources: ResourceManager