fix(web-analytics): Fix channel type

[robbie-c]

Problem

The channel stats table doesn't work, so use a workaround with simpler SQL.

Changes

Hard-code the SQL for the channel stats table

How did you test this code?

Tests still pass, runs manually ok.

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ ValueError: Missing required key group_type_index for property type group /api/projects/{parent_lookup_team_id}/query/ View Issue

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