[JupyterLab Extension] PoC: Use Existing ESCAPE IAM Token in UI

[tomondre]

Description

Implement a PoC in the JupyterLab extension to use an already obtained ESCAPE IAM JWT token (no user interaction) for REANA API calls. This task concerns only the logic for objecting and using the existing token. Implement a PoC in the JupyterLab extension to use an already obtained ESCAPE IAM JWT token (no user interaction) for authenticated REANA API calls. The work will most likely involve changes in both the UI login logic (skipping it) and JupyterLab server handlers.

DoD

• Read and inject existing OAuth2.0 token into API requests
• Ensure token is used automatically without user prompts
• Handle missing/invalid token cases in UI gracefully

[tomondre]

Open Questions:

• Should the token be rotated? If so, how?

Edit: The token expiration is not a problem

[tomondre]

Currently has prerequisites:

• Injected REANA_JWT in the container
• Injected REANA_SERVER_URL in the container

[tomondre]

👀 (WIP) #70