fix(webhook/discord): fixed username cannot be empty error (#35412) #35417
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Backport #35412 by @ulnanlu
username field is not required by discord and used to override the default username. sending it as blank causes a 400 error. it should be omitted instead when it's not set.
Ref: https://discord.com/developers/docs/resources/webhook#execute-webhook-jsonform-params
Closes #35411