ROU-12609: Rename DropdownServerSideItem OnSelect params and add optional parent dropdown id

[gnbm]

This PR is for updating the DropdownServerSideItem OnSelect event contract to improve naming clarity and support reusable logic.

What was happening

• DropdownServerSideItem OnSelect event used less explicit parameter names.
• Consumer logic had no direct parent DropdownServerSide identifier from the callback payload.

What was done

• Renamed OnSelect parameter dropdownId → dropdownServerSideItemId
• Renamed OnSelect parameter dropdownItemId → itemOptionId
• Added new optional OnSelect parameter dropdownServerSideId
• Updated callback invocation to pass parent id when available.
• Validated with lint/build.

Test Steps

1. Got to a test screen with a DropdownServerSide
2. Select an option
3. Check that the three parameters are returned in the OnSelect event with the expected value

Screenshots

Checklist

• tested locally
• documented the code
• clean all warnings and errors of eslint
• requires changes in OutSystems (if so, provide a module with changes)
• requires new sample page in OutSystems (if so, provide a module with changes)

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud