Expert 401 responses cause platform logout

[Steve-Mcl]

Current Behavior

Recently, the auth method for FF Expert backend was changed. As a result, calls to the Expert BE that are not permitted now receive a 401.

Due to the common interceptor in frontend/src/api/client.js this causes logout to be called.

Expected Behavior

A 401 from an external service should not logout the user

Steps To Reproduce

Operate the expert on a staging env (since this is currently in limbo, you will see that)

Environment

• FlowFuse version:
• Node.js version:
• npm version:
• Platform/OS:
• Browser:

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