Issue #2929133 by voleger, alexpott, Lendude: Replace all usages of getMock()

...ests/src/Unit/Plugin/AggregatorPluginSettingsBaseTest.php

core/modules/ban/tests/src/Unit/BanMiddlewareTest.php

...odules/block/tests/src/Unit/BlockConfigEntityUnitTest.php

core/modules/block/tests/src/Unit/BlockFormTest.php

core/modules/block/tests/src/Unit/BlockRepositoryTest.php

...modules/block/tests/src/Unit/CategoryAutocompleteTest.php

...modules/block/tests/src/Unit/Menu/BlockLocalTasksTest.php

...s/src/Unit/Plugin/DisplayVariant/BlockPageVariantTest.php

...ontent/tests/src/Unit/Menu/BlockContentLocalTasksTest.php

core/modules/book/tests/src/Unit/BookManagerTest.php

core/modules/breakpoint/tests/src/Unit/BreakpointTest.php

...modules/comment/tests/src/Unit/CommentLinkBuilderTest.php

core/modules/comment/tests/src/Unit/CommentManagerTest.php

...ules/comment/tests/src/Unit/CommentStatisticsUnitTest.php

...modules/comment/tests/src/Unit/Entity/CommentLockTest.php

...tests/src/Unit/Plugin/views/field/CommentBulkFormTest.php

...fig_translation/tests/src/Unit/ConfigEntityMapperTest.php

...nfig_translation/tests/src/Unit/ConfigFieldMapperTest.php

...ig_translation/tests/src/Unit/ConfigMapperManagerTest.php

...nfig_translation/tests/src/Unit/ConfigNamesMapperTest.php