ci: Notify failure mattermost

[marcPineiroAave]

General Changes

• Adds Notify failure of actions to a mattermost channel feature

Developer Notes

Added a job to all workflows to notify a matteramost channel via webhook.
Example: marcPineiroAave#13

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[marcPineiroAave]

A secret with the mattermos channle webhook needs to be added to the project, since the fork one points to a testing channel.

[JoaquinBattilana]

Closing this, we don't use MM anymore