Revert "OBMFULL-5632 Add DatabaseConnectionProvider integration test"

This reverts commit 519e31425335ec4b54e70d76fef77ae7054ec18f.
Revert "OBMFULL-5632 Close JDBC connection when Exception occured during its configuration"

This reverts commit d5f7553dee57b23a3aab28f5d74d075eca70b057.