Cannot Create EH compatible endpoint if IoT Hub name is more than 25 chars

[swathipil]

IoT Hub Service is silently truncating the IoT Hub name in the Event Hub compatible endpoint to 25 characters. This is not documented anywhere.

This silent mutation of information passed in by the user should not be happening. Since this is a service issue, we have contacted the IoT team to let them know about the bug, so that they can either fix it or document it.

A PR was created to address this issue in EH: #18521
We decided not to accept the PR since it would also mean silently changing information passed in by the user.

TODO:

• poke the service team again about this issue

[swathipil]

After discussion with Jesse + Sherry Shu, it was found that C# was no longer able to reproduce this error. In Python, realized that we need to get the IoT Hub name from the redirection address.