Add failure logging to DiscordWebhook.cs (#30835)

Add failure logging to DiscordWebhook.cs (#30835)

* Add failure logging to DiscordWebhook.cs

Add a new function that logs errors with discord webhook's http requests.

Create, Delete, and Edit functions were modified slightly to call the log function but return the same information as before.

The log function logs the error code, caller method using a simple constant (could be better), and attempts to log headers mentioned in issue #30248.

* remove extra ';'

Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>
* Move header error logs to debug

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Co-authored-by: metalgearsloth <31366439+metalgearsloth@users.noreply.github.com>
Co-authored-by: Pieter-Jan Briers <pieterjan.briers+git@gmail.com>