Issue #3019796 by heddn, mikelutz: Run D.O. tests with deprecation notices enabled

drupalci.yml

migrate_json_example/migrate_json_example.install

src/Entity/Migration.php

src/Entity/MigrationGroup.php

...est/config/install/migrate_plus.migration.fruit_terms.yml

...t/config/install/migrate_plus.migration_group.default.yml

tests/modules/migrate_plus_test/migrate_plus_test.info.yml

tests/src/Kernel/MigrationConfigEntityTest.php

tests/src/Unit/data_fetcher/HttpTest.php