refactor(consume): rename conftest to single_test_client plugin

Plugins called 'conftest' are registered automatically if in a sub-path to a test. This rename requires an explicit registration, which is specified by defining the `pytest_plugins` variable in 'engine/conftest.py', respectively, 'rlp/conftest.py'.

Author: danceratopz

src/pytest_plugins/consume/simulators/engine/conftest.py

@@ -14,6 +14,8 @@
 from ethereum_test_fixtures import BlockchainEngineFixture
 from ethereum_test_rpc import EngineRPC
 
+pytest_plugins = "pytest_plugins.consume.simulators.single_test_client"
+
 
 def pytest_configure(config):
     """Set the supported fixture formats for the engine simulator."""

src/pytest_plugins/consume/simulators/rlp/conftest.py

@@ -11,6 +11,8 @@
 
 TestCase = TestCaseIndexFile | TestCaseStream
 
+pytest_plugins = "pytest_plugins.consume.simulators.single_test_client"
+
 
 def pytest_configure(config):
     """Set the supported fixture formats for the rlp simulator."""