Improve tests for Row and _LazyVectorizedRow

[lars-reimann]

Tests for methods of Row (interface) and _LazyVectorizedRow (implementation) are missing entirely or for some edge cases.

We should

• remove the outdated test_rows.py
• create a folder tests/safeds/data/tabular/containers/
• create individual files inside the folder for the different methods of Row (same structure as for other containers of tabular data).

Use parametrized tests to cover edge cases. Similar to assert_cell_operation_works for cells, a helper assert_row_operation_works can greatly simplify the implementation of the tests.

[lars-reimann]

🎉 This issue has been resolved in version 0.27.0 🎉

The release is available on:

• v0.27.0
• GitHub release

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