[NRL-1658] Remove passthroughBehaviour from /metadata endpoint. Re-instate capability statement smoke tests

Author: mattdean3-nhs

api/consumer/swagger.yaml

@@ -404,7 +404,6 @@ paths:
             responseTemplates:
               # prettier-ignore
               application/json: '${capability_statement_json}'
-        passthroughBehavior: when_no_match
 
   /_status:
     get:

api/producer/swagger.yaml

@@ -937,7 +937,6 @@ paths:
             responseTemplates:
               # prettier-ignore
               application/json: '${capability_statement_json}'
-        passthroughBehavior: when_no_match
 
   /_status:
     get:

tests/smoke/scenarios/api_capability_statement_lookup.py

@@ -1,17 +1,6 @@
-import os
-
-import pytest
-
 from tests.utilities.api_clients import ConsumerTestClient, ProducerTestClient
 
 
-def is_public_url():
-    return os.environ.get("TEST_CONNECT_MODE") == "public"
-
-
-@pytest.mark.skip(
-    reason="Capability statements only work via APIGEE in persistent environments",
-)
 def test_read_api_capability_statements(
     consumer_client: ConsumerTestClient, producer_client: ProducerTestClient
 ):