fix: tests against FluentCard and other fixes

[Andras-Csanyi]

Pull Request

📖 Description

This Pr contains the following changes:

• bunit render tests against FluentCard, the tests checking the rendered HTML
• Target parameter input validation for FluentAnchor and tests extended accordingly
• FluentBadge appearance input parameter validation tests
• Target parameter input validation for FluentBreadcrumbItem and tests extended accordingly

🎫 Issues

• there are no related issues

👩‍💻 Reviewer Notes

• I apologise in advance because I feel that this PR might be bigger/wider than it should be, I wanted to make these changes in one go
• in case of FluentAnchor and FluentBreadcrimbItem Target parameter validation I followed the pattern I found at other components, however I see the opportunity to extract Target possible values and use this common list across components
• the build of this PR will display warnings until Fix: warnings in Calendar and Button tests #309 is not merged, once it is merged warnings should disappear

📑 Test Plan

• the component changes come with their tests

✅ Checklist

General

• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation and followed the standards for this project.

Component-specific

• I have added a new component
• I have modified an existing component

⏭ Next Steps