[IMPROVEMENT] Missing `DatasetType`s and `ComponentType`s

[figueroa1395]

In #648, DatasetTypes and ComponentTypes were introduced to replace string based component and dataset types while keeping backwards compatibility - this closed issue #613. However, there are still several places across the codebase where strings are still used, i.e. test for the validation functions (https://github.com/PowerGridModel/power-grid-model/tree/main/tests/unit/validation), among others.

The goal of this issue is to fix this by homogenizing the codebase and replacing all the instances of strings with DatasetType and ComponentType, where this is applicable. Nevertheless, this is unrelated with #949, as AttributeTypes have not been introduced yet.