[Dialog] Add event before closing panel to allow validation of the data provided by the user

[diegomodolo]

…ta. (#1508)

Pull Request

📖 Description

I've added functionality to prevent the panel from closing if rules defined by the user don't pass. I've added a func that will be called when the user clicks the button to commit the changes (won't be called on cancel or dismiss), and that func will return true or false, accordingly to the user validation rules.

🎫 Issues

#1508

👩‍💻 Reviewer Notes

📑 Test Plan

✅ Checklist

General

• [ ] I have added tests for my changes.
• [X] I have tested my changes.
• [X] I have updated the project documentation to reflect my changes.
• [X] I have read the CONTRIBUTING documentation and followed the standards for this project.

Component-specific

• [ ] I have added a new component
• [ ] I have added Unit Tests for my new component
• [X] I have modified an existing component
• [ ] I have validated the Unit Tests for an existing component

⏭ Next Steps