test: fix failing integration tests

[karenc-bq]

Description

Hanging Tests

• When there's a network issue, calling conn.close() may hang indefinitely. This PR wraps these direct calls in a timeout to ensure application doesn't block the main workflow when we only want to do a best attempt at closing a connection.

Failing Tests

• PG occasionally throws a different type of network error that we weren't handling properly
• We were testing EFM2 against MySQL. Since EFM2 isn't supported for MySQL, some integration test cases would fail. This PR reverted some of those test changes. We will need to do handle this more carefully in a separate PR.

Chores

• Added a few more log messages
• Refactored the integration tests code to allow running tests locally with a specific number of instances.
• Ensure all thread pool executors have a name so they are easier to identify when debugging
• Updated GH workflow to stagger the LTS and Latest integration tests so we are not creating as many instances at once

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[karenc-bq]

will remove this once integration tests pass

[karenc-bq]

deleting this test case because it is already being covered by other tests