Add visitor tour with notebook links AB test
Created by: erzhtor
Closes https://github.com/sourcegraph/sourcegraph/issues/36779.
Tracking / event logs
Screenshots
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Recording
https://www.loom.com/share/f01275f9a44d40dba54c4b35332605e9
Test plan
sg start dotcom- Open https://sourcegraph.test:3443/search?feature-flag-key=tour-visitors-notebook&feature-flag-value=true as not signed in user
- Go through tour
App preview:
Check out the client app preview documentation to learn more.