🐞 fix: Handle Google social login with missing last name

[DPK101]

Summary

Social login with Google was previously displaying 'undefined' when a user's last name was empty or not provided.

Changes:

• Conditionally render last name only if it exists
• Prevent displaying 'undefined' when last name is missing

Change Type

• Bug fix (non-breaking change which fixes an issue)

Testing

• To verify this, one should use Google account without last name for account registration through social login
• After succesful registration, verify that profile name doesn't include 'undefined' as last name (bottom left corner)

Checklist

• My code adheres to this project's style guidelines
• I have performed a self-review of my own code
• My changes do not introduce new warnings
• Local unit tests pass with my changes

[danny-avila]

Thanks! Merging your commit in #5904