Add new props and secondary slot to ApplicationHeader

[bengisusagir]

💡 What is the current behavior?

• The ApplicationHeader component is missing the following properties: NameSuffix, CompanyLogo, CompanyLogoAlt, AppIcon, AppIconAlt, and HideBottomBorder.
• The ApplicationHeader component also does not support a secondary slot.

🆕 What is the new behavior?

• Added the following properties to the ApplicationHeader component: NameSuffix, CompanyLogo, CompanyLogoAlt, AppIcon, AppIconAlt, and HideBottomBorder.

• Added support for a secondary slot in the ApplicationHeader component.

🏁 Checklist

A pull request can only be merged if all of these conditions are met (where applicable):

• 🦮 Accessibility (a11y) features were implemented
• 🗺️ Internationalization (i18n) - no hard coded strings
• 📲 Responsiveness - components handle viewport changes and content overflow gracefully
• 📄 Documentation was reviewed/updated
• [x ] 🧪 Unit tests were added/updated and pass (dotnet test)
• [x ] 🏗️ Successful compilation (dotnet build, changes pushed)

👨‍💻 Help & support