fix: SQLite AnyQueryResult::last_insert_id() always returns None

[CairoLee]

Summary

AnyQueryResult::last_insert_id() always returns None when using the SQLite backend through the Any driver, even after a successful INSERT into a table with INTEGER PRIMARY KEY AUTOINCREMENT.

Root Cause

The map_result() function in sqlx-sqlite/src/any.rs hardcodes last_insert_id: None:

fn map_result(res: SqliteQueryResult) -> AnyQueryResult {
    AnyQueryResult {
        rows_affected: res.rows_affected(),
        last_insert_id: None, // <-- always None
    }
}

This is the function called by AnyConnectionBackend::fetch_many() for every query result.

Note that #3608 added a correct From<SqliteQueryResult> for AnyQueryResult implementation in query_result.rs, but the fetch_many code path still calls map_result() rather than using From, so that fix never takes effect.

Fix

Replace the manual construction in map_result() with a delegation to the existing From impl:

fn map_result(res: SqliteQueryResult) -> AnyQueryResult {
    AnyQueryResult::from(res)
}

Reproduction

sqlx::any::install_default_drivers();

let pool = AnyPool::connect("sqlite::memory:").await?;

sqlx::query("CREATE TABLE test (id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL)")
    .execute(&pool)
    .await?;

let result = sqlx::query("INSERT INTO test (name) VALUES (?)")
    .bind("Alice")
    .execute(&pool)
    .await?;

// Before fix: None
// After fix:  Some(1)
println!("{:?}", result.last_insert_id());

Test Plan

• Added regression test any_query_result_has_last_insert_id in tests/sqlite/any.rs
• Test creates a temporary table, inserts two rows, and asserts that last_insert_id() returns Some(1) and Some(2) respectively

Closes #2982