[Bug] Connection failures due to JMX Auth or JMX Untrusted TLS cert simply result in "Gateway Timeout"

[andrewazores]

Current Behavior

When attempting to perform some action (ex. list active recordings) on a target which requires JMX authentication and/or uses a JMX TLS cert which is not trusted, the UI stays in a loading state for some time and eventually displays an error notification with an "HTTP Gateway Timeout" message. This is a regression from the 2.x series releases, which would detect the root cause of the failure and respond to the client with a more informative error message which the web-client used to display a helpful modal/popup prompting the user to either add stored credentials or add the certificate to truststore.

Expected Behavior

No response

Steps To Reproduce

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Environment

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Anything else?

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