Integrate Kyma Companion into Busola

[chriskari]

To integrate the Kyma Companion into Busola based on the POC changes, the following steps are required:

API / Backend related:

• Add cluster authorization to all API requests
• Integrate POST /conversations endpoint to initialize conversations
• Integrate POST /conversations/{conversation_id}/messages endpoint to send and receive messages
• Handle streaming of responses
• Integrate GET /conversations/{conversation_id}/questions to receive follow-up questions
• Proper error handling (with meaningful message from backend)

Frontend related:

• Store session_id securely on client-side
• Open AI assistant from top toolbar, leave open upon resource / view changes
• Remove initial popup -> populate chat with welcome message and initial questions
• Remove Tabs component from chat interface
• Add AI disclaimer below input
• Add Setup in editor button capabilities
• block input when waiting for response using time-icon
• Update UI5 components and adjust look to match design Kyma.Companion-compressed.pdf
• Hide behind feature flag
• adjust types

Testing:

• Add unit tests
• Add integration tests

[mrCherry97]

duplicated: #3436