fix: guard isGravatarUrl against invalid URL strings

[adids1221]

Description

PR #4033 replaced url-parse with the native URL API in AvatarHelper. However, the native URL constructor throws a TypeError when given an invalid URL string (e.g. 'fakeUrl', ''), unlike url-parse which was lenient.

This caused headless test failures in wix-react-native-ui-lib when Avatar components received non-URL strings as the image source — isGravatarUrl would throw instead of returning false.

The fix wraps new URL(url) in a try/catch inside isGravatarUrl and returns false for any input that isn't a valid URL.

Changelog

AvatarHelper — isGravatarUrl now returns false for invalid URL strings instead of throwing.

Additional info

Fixes the regression introduced by #4033. Caught by headless tests in wix-react-native-ui-lib where Avatar receives arbitrary strings as image URIs.

[github-actions]

✅ PR Description Validation Passed

All required sections are properly filled out:

• ✅ Description
• ✅ Changelog
• ✅ Additional info

Your PR is good for review! 🚀

---

This validation ensures all sections from the PR template are properly filled.