## Summary
This PR adds a guided tour for the new expandable flyout in alerts
table.
Where it will show up:
✅ Alerts page
✅ Alerts tab in Cases
Tour will not show up in:
❌ rule creation
❌ flyout in timeline
❌ event table.
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**How to test**
- Generate some alerts and go to Alerts page
- Expand a row in alerts table
- Guided tour should appear
- Note that rule preview is only available to alerts. Guided tour for an
event or alert preview does not have that step.
To test guided tour in event and timeline, enable
`expandableEventFlyoutEnabled`, `expandableTimelineFlyoutEnabled`
respectively.
### Checklist
- [x] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)
- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
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