Jira issues - Display error message returned from jira response

What does this MR do and why?

The current code assumes that the error_messages will be included in the message from Jira but according to the Jira documentation the error_messages are returned in the response body.

Change in this MR: If an error occurs with a status of 'Bad Request', the code attempts to parse the error_messages. If successful, it returns them; otherwise, it defaults to a generic message.

Resolves issue: #426034 (closed)

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