refactor: Add synchronous option for SQLite tests

[neznaika0]

Description
On some systems, there may be a huge drop when reading/writing even to SSD. I think data loss is not critical for tests, you can disable it.
The framework already knows how to work with the option, it's worth leaving at least NORMAL (1) in production.
See see https://www.sqlite.org/pragma.html#pragma_synchronous

UPD:

// Before PHP 8.4
Time: 00:34.360, Memory: 80.50 MB
// Before PHP 8.3
Time: 00:25.448, Memory: 78.50 MB

// After PHP 8.4
Time: 00:07.573, Memory: 80.50 MB
// After PHP 8.3
Time: 00:07.320, Memory: 78.50 MB

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value (without duplication)
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide

[michalsn]

Please move this to app/Config/Database::tests, under the busyTimeout option.
It's better to declare this explicitly, since that way it can be easily overridden via the .env file.

Also, please set it to null so we can rely on the default value provided by SQLite3. If you need to change it later, you'll have an easy way to do so.

[michalsn]

Thank you!

[paulbalandan]

Thank you, @neznaika0