Fix/cmake test only build (#6709)

* fix(cmake): guard filter_string_test behind WITH_ORACLE or WITH_CLIENT. filter_string_test links against libcockatrice_filters, which is only built when WITH_ORACLE or WITH_CLIENT is enabled. Without this guard, test-only builds fail at configure time because the target doesn't exist. The guard condition mirrors the one in the root CMakeLists.txt that controls whether libcockatrice_filters is built.

* fix(cmake): centralize TEST_QT_MODULES in FindQtRuntime.cmake  Each test CMakeLists.txt was independently defining TEST_QT_MODULES with its own subset of Qt modules. This duplicated knowledge that already lives in FindQtRuntime.cmake (which handles module discovery for all other targets: SERVATRICE, COCKATRICE, ORACLE). Consolidate into a single definition using the union of all test requirements (Concurrent Network Svg Widgets), matching the existing pattern for application-target modules. This ensures test-only builds (-DTEST=ON without application targets) discover all necessary Qt components.

* fix(cmake): guard libcockatrice_network behind application targets. libcockatrice_network is only needed by the client, server, and oracle targets. Other application-specific libraries (settings, models, filters) already have similar guards. This was an oversight that caused test-only builds to fail when network dependencies weren't available.

tests/oracle/CMakeLists.txt

@@ -4,8 +4,6 @@ if(NOT GTEST_FOUND)
   add_dependencies(parse_cipt_test gtest)
 endif()
 
-set(TEST_QT_MODULES ${COCKATRICE_QT_VERSION_NAME}::Widgets)
-
 target_link_libraries(parse_cipt_test Threads::Threads ${GTEST_BOTH_LIBRARIES} ${TEST_QT_MODULES})
 
 add_test(NAME parse_cipt_test COMMAND parse_cipt_test)