With the Unified Slack app we now have two ways of calling commands.
1. Legacy one when command invoked directly: /escalate
2. Unified one: /grafana escalate
On top of that we have different slach commands for each environment:
/escalate-local, /escalate-dev, etc. It was leading to a weird command
to escalate via Unified App in dev u need to type: /grafana-dev
escalate-develop.
To support both, I introduced a matcher function for SlashCommandRoutes.
It allows to simplify handling of such cases without complex workarounds
in an EventAPIEndpoint.
# What this PR does
## Which issue(s) this PR closes
Related to [issue link here]
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## Checklist
- [x] Unit, integration, and e2e (if applicable) tests updated
- [ ] Documentation added (or `pr:no public docs` PR label added if not
required)
- [ ] Added the relevant release notes label (see labels prefixed w/
`release:`). These labels dictate how your PR will
show up in the autogenerated release notes.
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