Issue #2262407 by slashrsm, roderik: Deprecate comment_get_display_page/ordinal().

core/modules/comment/comment.module

core/modules/comment/src/CommentForm.php

core/modules/comment/src/CommentManagerInterface.php

core/modules/comment/src/CommentStorage.php

core/modules/comment/src/CommentStorageInterface.php

core/modules/comment/src/CommentViewBuilder.php

core/modules/comment/src/Controller/CommentController.php

...odules/comment/src/Plugin/Field/FieldType/CommentItem.php

core/modules/comment/src/Tests/CommentInterfaceTest.php

core/modules/comment/src/Tests/CommentNodeAccessTest.php

core/modules/comment/src/Tests/CommentPagerTest.php

core/modules/comment/src/Tests/CommentPreviewTest.php

core/modules/comment/src/Tests/CommentStatisticsTest.php

core/modules/comment/src/Tests/CommentThreadingTest.php

core/modules/rdf/src/Tests/CommentAttributesTest.php