Issue #2124619 by alexpott: Stop creating user_picture() field programatically.

...s/comment/lib/Drupal/comment/Tests/CommentPreviewTest.php

core/modules/user/lib/Drupal/user/Tests/UserPictureTest.php

core/modules/user/user.install

...iles/standard/config/entity.display.user.user.compact.yml

...iles/standard/config/entity.display.user.user.default.yml

...standard/config/entity.form_display.user.user.default.yml

...rofiles/standard/config/field.field.user.user_picture.yml

...standard/config/field.instance.user.user.user_picture.yml

core/profiles/standard/standard.install