Add unit tests for imported products

Added unit tests for the imported_* products: both the create_imported_* and import_* workflows are now tested, and the fixtures have been updated so these kinds of products can now also be used in other tests.

Test coverage up from ~80% to 92%

test/workflows/iptrunk/test_create_imported_iptrunk.py

+import pytest
+from orchestrator.types import SubscriptionLifecycle
+
+from gso.products import ProductName
+from gso.products.product_blocks.iptrunk import IptrunkType, PhysicalPortCapacity
+from gso.products.product_types.iptrunk import ImportedIptrunk
+from test.workflows import (
+    assert_complete,
+    extract_state,
+    run_workflow,
+)
+
+
+@pytest.mark.workflow()
+def test_create_imported_iptrunk_success(faker, nokia_router_subscription_factory):
+    input_data = {
+        "partner": "GEANT",
+        "geant_s_sid": faker.geant_sid(),
+        "iptrunk_description": faker.sentence(),
+        "iptrunk_type": IptrunkType.DARK_FIBER,
+        "iptrunk_speed": PhysicalPortCapacity.FOUR_HUNDRED_GIGABIT_PER_SECOND,
+        "iptrunk_minimum_links": 2,
+        "iptrunk_isis_metric": 10000,
+        "side_a_node_id": nokia_router_subscription_factory(),
+        "side_a_ae_iface": faker.network_interface(),
+        "side_a_ae_geant_a_sid": faker.geant_sid(),
+        "side_a_ae_members": [
+            {"interface_name": faker.network_interface(), "interface_description": faker.sentence()} for _ in range(3)
+        ],
+        "side_b_node_id": nokia_router_subscription_factory(),
+        "side_b_ae_iface": faker.network_interface(),
+        "side_b_ae_geant_a_sid": faker.geant_sid(),
+        "side_b_ae_members": [
+            {"interface_name": faker.network_interface(), "interface_description": faker.sentence()} for _ in range(3)
+        ],
+        "iptrunk_ipv4_network": faker.ipv4_network(max_subnet=31),
+        "iptrunk_ipv6_network": faker.ipv6_network(max_subnet=126),
+    }
+    result, _, _ = run_workflow("create_imported_iptrunk", [input_data])
+    state = extract_state(result)
+    imported_router = ImportedIptrunk.from_subscription(state["subscription_id"])
+
+    assert_complete(result)
+    assert imported_router.product.name == ProductName.IMPORTED_IP_TRUNK
+    assert imported_router.status == SubscriptionLifecycle.ACTIVE