DEVX-88 Migrate ProductTypeTransformUtils

[lojzatran]

Summary

JIRA: https://commercetools.atlassian.net/browse/DEVX-88

[codecov-commenter]

Codecov Report

Merging #981 (6e0f132) into DEVX-87_Migrate_ProductTypeReferenceResolutionUtils (cabb318) will decrease coverage by 0.02%.
The diff coverage is 89.65%.

❗ Current head 6e0f132 differs from pull request most recent head 70be819. Consider uploading reports for the commit 70be819 to get more accurate results

@@                                    Coverage Diff                                    @@
##             DEVX-87_Migrate_ProductTypeReferenceResolutionUtils     #981      +/-   ##
=========================================================================================
- Coverage                                                  96.27%   96.26%   -0.02%     
- Complexity                                                  4041     4042       +1     
=========================================================================================
  Files                                                        355      356       +1     
  Lines                                                      11794    11823      +29     
  Branches                                                     712      716       +4     
=========================================================================================
+ Hits                                                       11355    11381      +26     
- Misses                                                       339      340       +1     
- Partials                                                     100      102       +2     

Impacted Files	Coverage Δ
.../producttypes/utils/ProductTypeTransformUtils.java	89.65% <89.65%> (ø)

[salander85]

What about the direct references? AttributeReferenceType

[lojzatran]

The direct references are also tested in the test transform_ShouldReplaceProductTypeNestedAttributeReferenceIdsWithKeys. The test is testing set of the direct references, so in the end they're testing what you wrote here. But for better clarity I also added a test that does not have set of references, but only a direct reference: 89f1f39