feat(test): Add integration tests for SQL catalog against PostgreSQL and MySQL

[charlesdong1991]

Which issue does this PR close?

• Closes Lack of integration tests for SQL catalog implementation #673

What changes are included in this PR?

Adds integration tests for the SQL catalog implementation against PostgreSQL and MySQL backends.

This PR extends coverage to the other two supported database backends by adding Docker services and a parameterized integration test file.

Are these changes tested?

Yes, tests pass.

[github-actions]

This pull request has been marked as stale due to 30 days of inactivity. It will be closed in 1 week if no further activity occurs. If you think that’s incorrect or this pull request requires a review, please simply write any comment. If closed, you can revive the PR at any time and @mention a reviewer or discuss it on the dev@iceberg.apache.org list. Thank you for your contributions.

[blackmwk]

Hi, @charlesdong1991 We have moved all integration tests for catalog into this dir: crates/catalog/loader/tests. Please create tests similar those

[github-actions]

This pull request has been marked as stale due to 30 days of inactivity. It will be closed in 1 week if no further activity occurs. If you think that’s incorrect or this pull request requires a review, please simply write any comment. If closed, you can revive the PR at any time and @mention a reviewer or discuss it on the dev@iceberg.apache.org list. Thank you for your contributions.