Issue #3457458 by TR: Add parameter and return type hints to all test methods

tests/modules/rules_test_event/src/Event/GetterEvent.php

tests/src/Functional/ActionsFormTest.php

tests/src/Functional/ConditionsFormTest.php

tests/src/Functional/ConfigureAndExecuteTest.php

tests/src/Functional/OptionsProvider/OptionsProviderTest.php

tests/src/Functional/RulesBrowserTestBase.php

tests/src/Functional/RulesComponentListBuilderTest.php

tests/src/Functional/RulesDebugLogTest.php

tests/src/Functional/RulesUiEmbedTest.php

tests/src/Functional/TempStorageTest.php

tests/src/Functional/UiPageTest.php

tests/src/FunctionalJavascript/EventBundleTest.php

tests/src/Kernel/ConfigEntityDefaultsTest.php

tests/src/Kernel/ConfigEntityTest.php

tests/src/Kernel/ConfigSchemaTest.php

tests/src/Kernel/ConfigurableEventHandlerTest.php

tests/src/Kernel/ContextIntegrationTest.php

tests/src/Kernel/ContextProvider/CurrentDateContextTest.php

tests/src/Kernel/ContextProvider/CurrentPathContextTest.php

tests/src/Kernel/ContextProvider/SiteContextTest.php