src: centralize error logging into send_internal_server_error

Use only the exception messages as the main resource for error
messages.
The previous error code had string duplication in the form of:
	logging.error('msg here')
	raise Exception('msg here')

That approach also has the downside of having log duplication as
it had the local logging.err() and a global logging.exception()
inside send_internal_server_error capturing the exception message.
The actual code only requires raising an exception with a proper
error message.
Improve exception messages to give more error context.
Log every AssertionError as a backtrace.
Use the 'raise Exception from e' syntax to modify the a previously
raised exception 'e' into an exception with aditional context or
different type. This also prevents the message that warns about
newer exceptions being launch after an initial exception.

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