Issue #1932382 by Berdir, swentel: Use DrupalUnitTestBase for Field API tests.

core/modules/email/lib/Drupal/email/Tests/EmailItemTest.php

core/modules/field/lib/Drupal/field/Tests/ActiveTest.php

core/modules/field/lib/Drupal/field/Tests/BulkDeleteTest.php

core/modules/field/lib/Drupal/field/Tests/CrudTest.php

core/modules/field/lib/Drupal/field/Tests/DisplayApiTest.php

...les/field/lib/Drupal/field/Tests/FieldAttachOtherTest.php

...s/field/lib/Drupal/field/Tests/FieldAttachStorageTest.php

...ules/field/lib/Drupal/field/Tests/FieldAttachTestBase.php

core/modules/field/lib/Drupal/field/Tests/FieldInfoTest.php

...es/field/lib/Drupal/field/Tests/FieldInstanceCrudTest.php

...es/field/lib/Drupal/field/Tests/FieldItemUnitTestBase.php

...odules/field/lib/Drupal/field/Tests/FieldUnitTestBase.php

core/modules/field/lib/Drupal/field/Tests/ShapeItemTest.php

core/modules/field/lib/Drupal/field/Tests/TestItemTest.php

.../modules/field/lib/Drupal/field/Tests/TranslationTest.php

...dules/field/lib/Drupal/field/Tests/TranslationWebTest.php

...ib/Drupal/field_sql_storage/Tests/FieldSqlStorageTest.php

core/modules/file/lib/Drupal/file/Tests/FileItemTest.php

...modules/number/lib/Drupal/number/Tests/NumberItemTest.php

...les/options/lib/Drupal/options/Tests/OptionsFieldTest.php