MM-11782: Make archived channels experimental and off-by-default. (#9281)

* MM-11782: Make archived channels experimental and off-by-default.

* Fix test.

utils/config.go

@@ -506,7 +506,7 @@ func GenerateClientConfig(c *model.Config, diagnosticId string, license *model.L
 	props["EnableXToLeaveChannelsFromLHS"] = strconv.FormatBool(*c.TeamSettings.EnableXToLeaveChannelsFromLHS)
 	props["TeammateNameDisplay"] = *c.TeamSettings.TeammateNameDisplay
 	props["ExperimentalPrimaryTeam"] = *c.TeamSettings.ExperimentalPrimaryTeam
-	props["ViewArchivedChannels"] = strconv.FormatBool(*c.TeamSettings.ViewArchivedChannels)
+	props["ExperimentalViewArchivedChannels"] = strconv.FormatBool(*c.TeamSettings.ExperimentalViewArchivedChannels)
 
 	props["EnableOAuthServiceProvider"] = strconv.FormatBool(c.ServiceSettings.EnableOAuthServiceProvider)
 	props["GoogleDeveloperKey"] = c.ServiceSettings.GoogleDeveloperKey