Feat/1331 disables deduplication for incremental

[willi-mueller]

Description

This PR disables deduplication for the test case described by ingestr here: #971 (comment)

Related Issues

• Resolves disable rows deduplication if Incremental is attached to a resource with merge write disposition #1131

Questions

@rudolfix

1. I could not understand your points 2, 3, and 4 in the issue disable rows deduplication if Incremental is attached to a resource with merge write disposition #1131 . Are they already implemented in this PR?
2. I am not sure if the last test tests/extract/test_incremental.py::test_deduplication_on_write_disposition_not_merge makes sense at all because on write_disposition="replace" the table is truncated before the load. I included it because the ticket speaks of the merge write disposition so I wanted to test the opposite too. Feel free to drop this commit.
3. Are the assertions on the incremental's last_value superfluous?
4. I could not find a way to test that the incremental returns all values without deduplication. Thus, I implemented the tests by making assertions on the loaded data. Is this strategy fine?

TODO after merge

• notify the developers of ingestr

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