This PR fixes docs and UI to avoid usage of Grafana (Other) integration
which is using old mechanism for alert creation.
1. Rename Grafana (Other) integration to Grafana Alerting Legacy
2. Remove its mentions from docs and correct docs for connection Grafana
Alerting
3. Make AlertManager featured integration and upgrade its description.
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Co-authored-by: Rares Mardare <rares.mardare@grafana.com>
# What this PR does
Adds method to update alert group state by backsync
Related to https://github.com/grafana/oncall-private/issues/2542
Should be merged with
https://github.com/grafana/oncall-private/pull/2606
## Checklist
- [x] Unit, integration, and e2e (if applicable) tests updated
- [x] Documentation added (or `pr:no public docs` PR label added if not
required)
- [x] 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.
# What this PR does
Makes Telegram integration consistent with the rest of the system so it
uses the word "alert group" instead of "incident" when referring to
alert groups.
## Checklist
- [x] Tests updated
- [ ] Documentation added (N/A)
- [x] `CHANGELOG.md` updated
