[MQTT5.x] Improve security choice

[exalate-issue-sync]

Description

Currently, MQTT 5.x endpoint has its security choice defined as an anyOf in schema-form.json.

According to schema-form documentation: A schema with anyOf is valid if at least one of the subschemas is valid.

Problem here is we render this as a checkboxes group. Meaning we can select none of the entries.

It causes some issues when:

1. Creating an API with MQTT configured with no security
2. Try to add a endpoint → the inheritance of shared configuration is not working well because it selects the first checkbox

🌈 Resolution

• use oneOf in the schema-form.json. It will be rendered as a radio group, and so exactly one value will be selected
• add a NONE security entry, to be able to use MQTT 5.x without any security

[exalate-issue-sync]

This issue has been fixed in versions 4.0.9, 4.1.0