== Background
Readers Web have run numerous A/B tests for Page Previews and has been reporting their results as part of {T182315} and {T182314}.
The bucketing code for A/B testing will likely not be used any more now that the feature is live for all anonymous users on all Wikipedias. The code
== AC
[X] The config option PopupsAnonsExperimentalGroupSize and related code is removed.
[X] When PopupsEventLogging is enabled it will continue to log events for all users (we don't plan on using this, but a decision still remains about how we might use this again (see T193051)
[X] The `./getBucket` module is removed.
[X] The corresponding unit tests
== Testing criteria
* Generic page previews testing should be done on the beta cluster.
* Check both anonymous and a logged in user can opt in and out of page previews with predictable results
== Sign off steps
The following should be done as part of the sign off process:
[] Record the assets size change by disabling the code.