ROU-3712: Dropdown cell change handler returns wrong Id if text is duplicate

[OS-giulianasilva]

This PR is for fixing the dropdown with duplicated labels returning the wrong ID and not triggering OnCellValueChange

What was happening

• When the Dropdown has duplicated labels with different values, the OnCellValueChange returns the wrong ID or is not triggered when changing to an option with the same label.

What was done

• Now, we store the previous cell value into the beginningEdit, to validate if the value was changed into cellEditEnded.

Test Steps

1. Go to a page with a Grid containing dropdowns with duplicated option's labels
2. Change to another option with the same label
3. Check if the OnCellValue Changed was triggered and returns the correct value.

Screenshots

Before:

After:

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)

[rugoncalves]

Good job @OS-giulianasilva! Just pointed out a small improvement. But that's all

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

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