[MM-53026] - Disabled insights by default (#23702)

* Insights disabled by default

* fixed tests

* fixed tests

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

server/public/model/feature_flags.go

@@ -87,7 +87,7 @@ func (f *FeatureFlags) SetDefaults() {
 	f.BoardsDataRetention = false
 	f.NormalizeLdapDNs = false
 	f.GraphQL = false
-	f.InsightsEnabled = true
+	f.InsightsEnabled = false
 	f.CommandPalette = false
 	f.CallsEnabled = true
 	f.SendWelcomePost = true