🧹 Fix actionable TODO in d1_target_tests.rs

[bashandbone]

🎯 What: Implemented the ignored test_diff_setup_states_existing_table and removed the actionable TODO by using the updated recoco::setup::StateChange API.
💡 Why: To improve code health, increase test coverage, and resolve an actionable item regarding the construction of existing state using recoco::setup::StateChange::Upsert.
✅ Verification: Ran cargo test -p thread-flow test_diff_setup_states_existing_table to ensure the test runs successfully and no regressions are present.
✨ Result: Test coverage is expanded for existing states scenarios in d1_target_tests.rs.

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PR created automatically by Jules for task 6660970317694806160 started by @bashandbone

Summary by Sourcery

Implement test coverage for diffing setup states when a D1 table already exists.

New Features:

• Enable the previously ignored test for diffing setup states with an existing D1 table.

Tests:

• Add a concrete existing-state scenario using the updated recoco::setup::StateChange API to validate that no CREATE TABLE statement is generated when the table already exists.

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[sourcery-ai]

Reviewer's Guide

Implements the previously ignored test_diff_setup_states_existing_table by constructing an existing D1 setup state using the new recoco::setup::StateChange::Upsert API and asserting that no CREATE TABLE SQL is generated when the table already exists.

File-Level Changes

Change	Details	Files
Implement the previously ignored existing-table diff test using the updated StateChange API.	Removed the #[ignore] attribute and obsolete TODO comments from test_diff_setup_states_existing_table Created desired and existing D1SetupState instances using test table id and key/value schemas Constructed a CombinedState with a staging Vec containing a StateChange::Upsert of the existing state and no current state Instantiated a FlowInstanceContext required by diff_setup_states Called D1TargetFactory::diff_setup_states with desired and existing state and asserted that create_table_sql is None to confirm no CREATE TABLE is generated for existing tables	crates/flow/tests/d1_target_tests.rs

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[sourcery-ai]

Hey - I've left some high level feedback:

• Double-check that using staging: vec![StateChange::Upsert(existing_state)] with current: None correctly models an already-existing table in the CombinedState contract; if current is expected to represent the persisted state, it may be more accurate to populate current and leave staging empty for this scenario.
• Since this test is meant to validate behavior when the table already exists, consider adding assertions on other relevant fields of change (e.g., ensuring no ALTER/DROP operations are scheduled) to better capture the full expected outcome of the diff.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Double-check that using `staging: vec![StateChange::Upsert(existing_state)]` with `current: None` correctly models an already-existing table in the `CombinedState` contract; if `current` is expected to represent the persisted state, it may be more accurate to populate `current` and leave `staging` empty for this scenario.
- Since this test is meant to validate behavior when the table already exists, consider adding assertions on other relevant fields of `change` (e.g., ensuring no ALTER/DROP operations are scheduled) to better capture the full expected outcome of the diff.

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