* Add override_pinned_version support on configure connection for database (#10517)
* add DatabaseConfigEnt and split ce-ent impl for connectionWriteHandler() and selectPluginVersion()
* add override_pinned_version handling in connectionWriteHandler() and selectPluginVersion()
* split ce-ent impl for connectionReadHandler() to support override_pinned_version
* split ce-ent impl for databaseBackend.GetConnectionWithConfig() to support override_pinned_version
* split TestBackend_* units related to databased connection config CRUD into ce and ent
* remove EntDatabaseConfig from response
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Co-authored-by: Thy Ton <maithytonn@gmail.com>
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