fix(sql): close non-transactional execution connections

[bercianor]

Summary

• Close the JDBC connection injected for non-transactional SQL changes after apply or rollback.
• Make container-backed SQL test setup exception-safe and use the Informix-aware datasource helper.
• Add regression coverage for apply, rollback, callback failure, and datasource setup failure.

Verification

• :core:target-systems:flamingock-sql-targetsystem:test with Java 17.0.8-graal
• :community:flamingock-sql-auditstore:test --tests "*SqlAuditStoreTest*" -Psql.test.dialects=informix --no-parallel with Java 17.0.8-graal
• Nine-dialect SQL audit-store matrix with Java 17.0.8-graal

Scope

This PR contains only the SQL connection-lifecycle and Informix test-lifecycle bugfix. The SQL journal payload feature remains separate uncommitted WIP.