There are a number of issues with [[https://wikitech.wikimedia.org/wiki/Add_Link|Add Link]] on the beta cluster, which might or might not be caused by beta generally being broken all the time. Having it on testwiki would give us a little more confidence on what issues are specific to beta.
[x] Set `$wgGEDatabaseCluster`
[x] Set `$wgGELinkRecommendationServiceUrl`
[x] Set `$wgGELinkRecommendationServiceWikiIdMasquerade = 'simplewiki';`
[x] Create database tables for testwiki (see {T266913}): `mwscript extensions/WikimediaMaintenance/createExtensionTables.php --wiki=testwiki GrowthExperiments`
[x] Set `$wgGENewcomerTasksLinkRecommendationsEnabled = true;` and `$wgGELinkRecommendationsFrontendEnabled = true;` for testwiki
[x] Import some tasks, like in {T274198} //(there were plenty of pages already, imported some ORES topics)//