Issue #3487666 by mstrelan, nicxvan: Add void return type to all *_alter hook implementations

core/.phpstan-baseline.php

...es/announcements_feed/src/Hook/AnnouncementsFeedHooks.php

...ules/big_pipe_bypass_js/src/Hook/BigPipeBypassJsHooks.php

core/modules/block/src/Hook/BlockHooks.php

...lock/tests/modules/block_test/src/Hook/BlockTestHooks.php

core/modules/block_content/src/Hook/BlockContentHooks.php

...content/tests/src/Kernel/BlockTemplateSuggestionsTest.php

core/modules/ckeditor5/src/Hook/Ckeditor5Hooks.php

...ests/modules/ckeditor_test/src/Hook/CkeditorTestHooks.php

core/modules/comment/src/Hook/CommentHooks.php

core/modules/comment/src/Hook/CommentViewsHooks.php

...ble_test/src/Hook/CommentDisplayConfigurableTestHooks.php

.../tests/modules/comment_test/src/Hook/CommentTestHooks.php

...sts/config_import_test/src/Hook/ConfigImportTestHooks.php

...sts/config_schema_test/src/Hook/ConfigSchemaTestHooks.php

...es/config_translation/src/Hook/ConfigTranslationHooks.php

..._translation_test/src/Hook/ConfigTranslationTestHooks.php

core/modules/contact/src/Hook/ContactHooks.php

core/modules/contact/src/Hook/ContactViewsHooks.php

...es/content_moderation/src/Hook/ContentModerationHooks.php