augment API response pagination attributes (#2471 )

# What this PR does

This PR:
- adds a few attributes to paginated API responses
- removes channel filter "send demo alert" internal API endpoint + tests
(this endpoint was marked as deprecated + not consumed by the web UI)

With the new paginated API response schema, the web UI will no longer
need to:
- hardcode `ITEMS_PER_PAGE` for each table
- manually calculate total number of pages

(these two things ☝️ will be done in
https://github.com/grafana/oncall/issues/2476)

For `GET /api/internal/v1/alertgroups` the response will now look like
this:
```diff
{
    "next": <url> | None,
    "previous": <url> | None,
    "results": [],
++  "page_size": <int>
}
```

For all other paginated API responses, the response will now look like:
```diff
{
    "count": <int>,
    "next": <url> | None,
    "previous": <url> | None,
    "results": [],
++  "page_size": <int>,
++  "current_page_number": <int>,
++  "total_pages": <int>
}
```

## TODO
- [x] update public API docs to include these new attributes

## 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] `CHANGELOG.md` updated (or `pr:no changelog` PR label added if not
required)

2023-07-14 11:19:40 -04:00

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canonical	title	weight
https://grafana.com/docs/oncall/latest/oncall-api-reference/outgoing_webhooks/	Outgoing webhooks HTTP API	700

Outgoing webhooks (actions)

Used in escalation policies with type trigger_action.

List actions

curl "{{API_URL}}/api/v1/actions/" \
  --request GET \
  --header "Authorization: meowmeowmeow" \
  --header "Content-Type: application/json"

The above command returns JSON structured in the following way:

{
  "count": 1,
  "next": null,
  "previous": null,
  "results": [
    {
      "id": "KGEFG74LU1D8L",
      "name": "Publish alert group notification to JIRA"
    }
  ],
  "current_page_number": 1,
  "page_size": 50,
  "total_pages": 1
}

HTTP request

GET {{API_URL}}/api/v1/actions/

774 B Raw Blame History

Outgoing webhooks (actions)

List actions

774 B

Raw Blame History