refactor(admin): cancel_tx / cancel_by_unique_key_tx take &mut PgConnection (0.6.0-rc.3)

[hardbyte]

cancel_tx / cancel_by_unique_key_tx → &mut PgConnection

Corrects the rc.2 transaction-participating cancel API. rc.2 typed these as &mut sqlx::Transaction, which excludes callers that only hold a connection mid-transaction — e.g. behind a transact!-style helper that derefs the transaction to &mut PgConnection (exactly the downstream consumer's situation).

Change

• cancel_tx / cancel_by_unique_key_tx now take &mut PgConnection. A &mut Transaction deref-coerces to it, so existing callers are unaffected; connection-only callers now work too. This matches awa's existing multi-statement consumer convention (insert_many_copy, which takes &mut PgConnection "so callers can use pool connections or transactions").
• The public fns open a nested transaction (conn.begin() → a SAVEPOINT when the connection is already in one) and delegate to the unchanged &mut Transaction-based cancel_in_tx / cancel_by_unique_key_in_tx, so a cancel error rolls back only the cancel rather than poisoning the caller's transaction.
• Test exercises both a Transaction caller (deref coercion) and a bare &mut PgConnection caller.

Why this over the alternatives

• &mut Transaction (rc.2): excludes connection-only callers.
• impl Acquire: would unify pool+conn+tx into one fn, but adds generics/lifetimes and isn't a style awa uses anywhere; the cancel(pool) + _tx(conn) split already covers the cases.
• impl PgExecutor: unsafe for a multi-statement atomic op (a &Pool executor may use a different connection per statement).
• &mut PgConnection is the superset that fits every consumer and is consistent with insert_many_copy.

Verification

• fmt / clippy --all-targets --all-features -- -D warnings / build: clean.
• cargo test --test integration_test cancel: 10/10.
• TLA+ AwaSegmentedStorage: No error has been found.

Cuts 0.6.0-rc.3.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

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Run ID: b439fb17-2906-4b03-862d-4d984635b713

📥 Commits

Reviewing files that changed from the base of the PR and between 862b3e1 and a361dc5.

⛔ Files ignored due to path filters (1)

• Cargo.lock is excluded by !**/*.lock

📒 Files selected for processing (10)

• CHANGELOG.md
• Cargo.toml
• awa-cli/Cargo.toml
• awa-cli/pyproject.toml
• awa-model/src/admin.rs
• awa-python/Cargo.toml
• awa-python/pyproject.toml
• awa-seaorm/Cargo.toml
• awa/Cargo.toml
• awa/tests/integration_test.rs

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