Ensure backwards compatibility with v3 and v4 backends

[sbliven]

Ensure backwards compatibility with v3 and v4 backends

Summary

Backend v4 introduces some breaking changes. Off the top of my head:

1. new /api/v4 base URL if Upgrade API version to v4 scicat-backend-next#1101 approved
2. Authentication requires "accessTokenPrefix": "Bearer "
3. job DTO change (release-job branch)

Since backend v3 is expected to be supported for a while still, the frontend should support both versions without recompilation.

Changes needed

1. Upgrade API version to v4 scicat-backend-next#1101 should include a new frontend configuration to set the global prefix (default "api/v4")
2. No changes needed (already configurable)
3. Jobs components should accept either v3 or v4 DTOs in the frontend

So practically only (3) is required for this ticket; the others are just included for completeness.