Ensure all chat based integrations support notifications from all available triggers

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The following discussion from !65245 (merged) should be addressed:

• @toupeira started a discussion: (+2 comments)

  question: This also applies to other chat integrations besides Slack, which seems fine to me. But then I guess we'd need to update their docs as well? 🤔

  • app/models/integrations/discord.rb
  • app/models/integrations/hangouts_chat.rb
  • app/models/integrations/mattermost.rb
  • app/models/integrations/microsoft_teams.rb
  • app/models/integrations/slack.rb
  • app/models/integrations/unify_circuit.rb
  • app/models/integrations/webex_teams.rb