Added kernel tests for link formatter functionality.

Miroslav Stankovrequested to merge
issue/automatic_site_icon_picker-3561939:issue/unit_tests into 2.0.1

Tests cover formatter configuration, favicon fetching, and rendering behavior:

  • Default settings and settings form structure
  • Valid and invalid URL handling
  • Icon size variations (small, medium, large)
  • Display modes (icon only, icon with link, icon with title)
  • Error handling (API failures, directory creation errors)
  • Multiple link fields rendering
  • Link target attribute configuration
  • Domain-only URL parsing

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