No feedback when MQTT Client reached

[knolleary]

Current Behavior

If a team is at its limit of MQTT Clients, the 'create' button is still active and they can fill in the form to try to create a new one.

Clicking the confirm button does nothing - no feedback, dialog doesn't close.

Under the covers, the API request has been made and properly rejected with a 400 and limit reached error.

Expected Behavior

Feedback that they are at the limit of their team.

Don't show the create dialog. Disable the create button.

Steps To Reproduce

No response

Environment

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

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