We now match deployment actions better. If there is more than one
deployment action matched, we check if there is an action which name
equals to environment name, instead of raising an error about too many
actions defined.
Fix https://gitlab.com/gitlab-org/gitlab-ce/issues/27070
Deprecate "chat commands" in favor of "slash commands"
We looked for things like:
- `slash commmand`
- `slash_command`
- `slash-command`
- `SlashCommand`
