E2E Testing of DevGuard Web with Playwright

[juliankepka]

Refactor and extend the existing Playwright setup to cover DevGuard Web usability testing, focusing on high-level, initial core functionalities rather than deeply nested edge cases or isolated UI components.

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Update existing Playwright workflows and get them running

• Login Flow
• Light/Dark Mode
• Repo Flow
• Prerelease

New tests to implement

• Organization Creation
• Group Creation
• Repository Creation
• Invitation Flow (invite a user to an org/project)
• Logout + LoginAgain (explicit logout, redirect to login page)
• Setup Risk Scanning for GitLab Repo
• Filter Vulns

Additional tests to implement

• Manually start a DevGuard Scan using a SBOM
• Handle a vulnerability after DevGuard Scan

Refactoring

• Refactor POM to classes with dedicated functions