Add support for custom interaction fail message.

[Luc1412]

Manually moved issue #2877

Description

Add eg. in the Dashboard the ability to customize the interaction failed message. This allows developers to provide more information or links where the user can get help.

This also applies to "Invalid interaction application command". A user didn't know what happened, except knowing that some issue occurred indicated by the text color and exclamation mark

Why This is Needed

Currently, the "This Interaction failed" message isn't that helpful and can confuse inexperienced members. It would be helpful to answer the question of why this is so.

Also for planned maintenance or downtimes, this can be helpful to notify the user.

Alternatives Considered

Create a Helpdesk article providing more details of why an interaction can fail and what the user can do to get more information on that issue.