Use common naming convention for mocks

Currently, in score/launch_manager/ there are mocks defined with various filename patterns:

score/launch_manager/src/lifecycle_client/src/mwlifecyclemanagermock.h
score/launch_manager/src/lifecycle_client/src/lifecyclemanagermock.cpp
score/launch_manager/src/lifecycle_client/src/report_running_mock.h
score/launch_manager/src/lifecycle_client/src/report_running_mock.cpp
score/launch_manager/src/lifecycle_client/src/applicationcontextmock.cpp
score/launch_manager/src/lifecycle_client/src/lifecyclemanagermock.h
score/launch_manager/src/lifecycle_client/src/mwlifecyclemanagermock.cpp
score/launch_manager/src/lifecycle_client/src/applicationcontextmock.h
score/launch_manager/src/daemon/src/process_group_manager/details/mock_component_event_queue.hpp
score/launch_manager/src/daemon/src/process_group_manager/details/mock_termination_callback.hpp
score/launch_manager/src/daemon/src/process_group_manager/details/mock_component.hpp

We should decide for a single pattern and rename all files accordingly.

Note that mocks under score/launch_manager/src/lifecycle_client/src/ are exposed to users, so renaming those files is a breaking change.