fix: use built in auto-commit handler

[cofin]

Uses the built-in auto-commit handler that's now in the Litestar repository. This code is no longer required in fullstack.

Pull Request Checklist

• [x] New code has 100% test coverage
• [ ] (If applicable) The prose documentation has been updated to reflect the changes introduced by this PR
• [ ] (If applicable) The reference documentation has been updated to reflect the changes introduced by this PR
• [ ] Pre-Commit Checks were ran and passed
• [ ] Tests were ran and passed

Description

Close Issue(s)