Potential fix for code scanning alert no. 53: Information exposure through an exception

[jrtcppv]

Potential fix for https://github.com/cvisionai/tator/security/code-scanning/53

To fix the problem, we need to ensure that the detailed exception message is not exposed to the client. Instead, we should log the detailed error message on the server and return a generic error message to the client. This can be achieved by modifying the exception handling block to log the detailed error message and return a generic error message.

• Modify the exception handling block in the __call__ method of the KeycloakMiddleware class.
• Log the detailed error message using the logger.warning method.
• Return a generic error message in the JSON response to the client.

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