Import of Agents should handle "overwrite" Option correctly

Current Situation

The current Import functionality does not handle the "Overwrite" option consistently when importing agent configurations. This leads to different behaviors for standalone agents and cluster agents.

• When importing an exported agent configuration with the "Overwrite" checkbox selected, the subagents in the cluster agent are updated and transition to a "not synchronized" state.
  However, the standalone agent does not update accordingly.

• Also, when importing the same unchanged file back into the same environment without selecting the 'Overwrite' checkbox, an error occurs due to a unique constraint violation in the database:

DBInvalidDataException: could not execute statement [ ORA-00001: unique constraint (C##JS7G.UNIQUE_IAI_A) violated ] [insert into INV_AGENT_INSTANCES ("AGENT_ID","AGENT_NAME","CERTIFICATE","CONTROLLER_ID","DEPLOYED","DISABLED","HIDDEN","IS_WATCHER","JAVA_VERSION","MODIFIED","ORDERING","OS_ID","PROCESS_LIMIT","STARTED_AT","TITLE","URI","VERSION","ID") values (?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?,?)]: 1 ORA-00001: unique constraint (C##JS7G.UNIQUE_IAI_A) violated

Desired Behavior

The Import functionality should apply a consistent 'Overwrite' option behavior to both standalone and cluster agents:

• When the 'Overwrite' option is selected during the import, standalone agents should also update and transition to a 'not synchronized' state, similar to cluster agents.
• If the 'Overwrite' option is not selected during the import of the same unchanged file, a user-friendly error message should be displayed.