Migrate work item statuses dashboard from Snowflake to Tableau
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## Background
Snowflake dashboards are being deprecated, with existing dashboards scheduled for removal on June 22, 2026 as per https://gitlab.com/gitlab-data/analytics/-/work_items/27084.
As potential replacements, Streamlit and Tableau were proposed [here](https://gitlab.com/gitlab-data/analytics/-/work_items/27084#migration-paths). Our team has decided to use Tableau moving forward.
## Summary
Migrate the [existing configurable work item statuses dashboard](https://app.snowflake.com/ys68254/gitlab/#/custom-statuses-d8Wd9wmn7) from Snowflake to Tableau.
The list of available internal events that track status changes is listed in the design doc [here](https://handbook.gitlab.com/handbook/engineering/architecture/design-documents/work_items_custom_status/#telementry).
## Tasks
- [ ] Migrate the work item statuses dashboard from Snowflake to Tableau.
- [ ] Update the [dashboard link in the design doc](https://handbook.gitlab.com/handbook/engineering/architecture/design-documents/work_items_custom_status/#telementry) to point to the new Tableau dashboard.
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