Expectation tests to unit tests folder

[salabi]

What type of PR is this? (check all applicable)

• Refactor
• Feature
• Bug Fix
• Optimization
• Documentation Update

Description

Moves pure DatasetCheckpoint tests out of the integration test folder into tests/unit/expectations/checkpoints/test_dataset.py.

The integration file now only contains tests that exercise real spatialite-backed database behaviour. The moved unit tests keep the same logic and names

• test_get_rule_orgs
• test_parse_rule_formates_strings
• test_load_success
• test_load_skips_rule_not_scheduled_today
• test_load_includes_rule_scheduled_for_today
• test_save_carries_forward_skipped_rule_results
• test_save_skipped_rule_no_existing_parquet
• test_save_to_parquet

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Added/updated tests?

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• Yes
• No, and this is why: please replace this line with details on why tests
  have not been included
• I need help with writing tests

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