injected service use to handle the chat related operations
injected logger used to handle the logging
request context [headers, body, params, query].
200 Status OK
This handler will update message template by applying the following steps in sequence:
Update message template (chatService.updateMessageTemplate)
Get message template by id and normalize (chatService.getMessageTemplateByIdAndNormalize)
Return the message template
500 NBError Internal Server Error
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Update message template handler