java CDK: skip dropping database in PostgresTestDatabase::close

[postamar]

This PR follows up on #32314
I profiled some tests and noticed that we spent an stupendous amount of time closing the PostgresTestDatabase instances. As it turns out, DROP DATABASE is really slow. We don't need to do it so let's not.

This PR also gets rid of the tmpDir because it's not actually needed.

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[github-actions]

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[github-actions]

Coverage report for source-postgres

There is no coverage information present for the Files changed

Total Project Coverage	71.75%	🍏

[postamar]

/publish-java-cdk

🕑 https://github.com/airbytehq/airbyte/actions/runs/6816344297
✅ Successfully published Java CDK version=0.4.8!

[postamar]

/approve-and-merge reason="docker pull rate limit"

[octavia-approvington]

A job well done