[firebase_ui_auth] Do not throw an exception if provider icon is not found in `ProfileScreen`

[Rexios80]

Is there an existing issue for this?

• [X] I have searched the existing issues and found no duplicates.

What plugin is this bug for?

Firebase UI Auth

What platform(s) does this bug affect?

No response

List of dependencies used.

Not relevant

Steps to reproduce

• Sign in with OIDC
• Display the ProfileScreen
• See that there is an error getting the icon for the OIDC provider

Expected Behavior

One of the following:

• Ignore the providers with missing icons
• Extract the icons from the providers

Actual Behavior

Error getting the icon for the OIDC provider breaks the UI

Additional Information

No response