fix: [25]db_name will be overwritten by mistake (#2734)

[XuanYang-cn]

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Fix for 2727. Ensures that both passing a db_name as an explicit argument and as a path to the connection uri is used and not overwritten with an empty string. Added a couple of test cases.

[sre-ci-robot]

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[XuanYang-cn]

Group[0] might be address, holding for tests /hold

[XuanYang-cn]

/unhold

[XuanYang-cn]

/hold

[XuanYang-cn]

See #2954