chore: remove jwt-decode to remove vulnerability

[Scra3]

Definition of Done

General

• Write an explicit title for the Pull Request, following Conventional Commits specification
• Test manually the implemented changes
• Validate the code quality (indentation, syntax, style, simplicity, readability)

Security

• Consider the security impact of the changes made

[SteveBunlon]

Actually ! JWT is also used in tests. By convention we should use libraries from context only.

So, jwt should be added entirely in the context and this change should be propagated everywhere. That's quite some code !