Additional category attribute groups are not being migrated

### Preconditions

1. Magento 1.9.3.10
2. Magento 2.3.5

### Steps to reproduce

1. Have extra category attributes on a non-default attribute set in M1 database
2. Migrate data

### Expected result

1. Would expect category attributes and their attribute groups to be migrated

### Actual result

1. Error: Notice: Undefined offset: 18 in vendor/magento/data-migration-tool/src/Migration/Step/Eav/Data.php on line 498

### Additional notes
In the code I can find nothing that category attribute groups are migrated, this only happens for product attributes.

Start with vendor/magento/data-migration-tool/src/Migration/Step/Eav/Data.php at line 498 and reproduce the migration from Magento 1.9.3.10 to Magento 2.3.5 using category attributes on a non-default attribute set. Compare how product attributes are handled with the reported category case. Done means category attributes and their attribute groups migrate without the undefined-offset notice.

Written by the indexing model from the issue text.