Issue #2322889 by sun: Fixed Various setUp() and tearDown() methods are not protected.

core/modules/action/tests/src/Menu/ActionLocalTasksTest.php

core/modules/aggregator/src/Tests/AggregatorTestBase.php

core/modules/aggregator/src/Tests/FeedCacheTagsTest.php

core/modules/aggregator/src/Tests/FeedFetcherPluginTest.php

core/modules/aggregator/src/Tests/FeedLanguageTest.php

core/modules/aggregator/src/Tests/FeedParserTest.php

.../modules/aggregator/src/Tests/FeedProcessorPluginTest.php

core/modules/aggregator/src/Tests/ImportOpmlTest.php

core/modules/aggregator/src/Tests/ItemCacheTagsTest.php

...es/aggregator/tests/src/Menu/AggregatorLocalTasksTest.php

...tor/tests/src/Plugin/AggregatorPluginSettingsBaseTest.php

core/modules/block/src/Tests/BlockCacheTest.php

core/modules/block/src/Tests/BlockHiddenRegionTest.php

core/modules/block/src/Tests/BlockHookOperationTest.php

core/modules/block/src/Tests/BlockHtmlTest.php

core/modules/block/src/Tests/BlockInvalidRegionTest.php

core/modules/block/src/Tests/BlockLanguageCacheTest.php

core/modules/block/src/Tests/BlockLanguageTest.php

core/modules/block/src/Tests/BlockRenderOrderTest.php

core/modules/block/src/Tests/BlockSystemBrandingTest.php