Refactor all unit tests that compare lists of dataclass objects to use equal_list

[vingkan]

After #315 merges, we can find all unit tests that compare lists of dataclass objects and update them from:

assert actual == expected

To:

from pipeline.testing import equal_list
...
assert equal_list(actual, expected)

Which will enable easier test debugging if a test fails by only showing the dataclass attributes that differ in the first mismatched pair of items, rather than showing the entire list with all attributes of all items.

Will also need to handle #317,