[Public Dashboard] Subscribe AuthNotifier on the FeatureConfig updates

[solid-dimakoniaiev]

Description The handlePublicDashboardFeatureConfigUpdates() method of the AuthNotifier should be called when the FeatureConfigNotifier.publicDashboardFeatureConfigModel changes.

Acceptance Criteria

• [ ] The isPublicDashboardFeatureEnabled bool field added to the AuthNotifier
• [ ] The handlePublicDashboardFeatureConfigUpdates() method implemented
• [ ] The handlePublicDashboardFeatureConfigUpdates() method integrated to the FeatureConfigNotifier listener inside the InjectionContainer
• [ ] Tests added

Additional context Public dashboard design