Add e2e test for deletion with pg log-based replication

[Tolsto]

Currently, deleting a record when using Postgres with log-based replication
will overwrite all non-PK and non-metadata columns in Snowflake with null.

This is an integration test for the fix in
transferwise/pipelinewise-target-snowflake#276

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• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
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Checklist

• I have read the CONTRIBUTING doc
• Description above provides context of the change
• I have added tests that prove my fix is effective or that my feature works
• Unit tests for changes (not needed for documentation changes)
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• Bumping version in setup.py is an individual PR and not mixed with feature or bugfix PRs
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• Relevant documentation is updated including usage instructions