MM-30801: pre-package channel export plugin (#16406)

* MM-30801: pre-package channel export plugin

The [channel export plugin](https://github.com/mattermost/mattermost-plugin-channel-export) complements [incident management](https://github.com/mattermost/mattermost-plugin-incident-management).

* only enable IM/CE by default on enterprise ready builds

model/config.go

@@ -2676,11 +2676,16 @@ func (s *PluginSettings) SetDefaults(ls LogSettings) {
 		s.PluginStates["com.mattermost.nps"] = &PluginState{Enable: ls.EnableDiagnostics == nil || *ls.EnableDiagnostics}
 	}
 
-	if s.PluginStates["com.mattermost.plugin-incident-management"] == nil {
+	if s.PluginStates["com.mattermost.plugin-incident-management"] == nil && BuildEnterpriseReady == "true" {
 		// Enable the incident management plugin by default
 		s.PluginStates["com.mattermost.plugin-incident-management"] = &PluginState{Enable: true}
 	}
 
+	if s.PluginStates["com.mattermost.plugin-channel-export"] == nil && BuildEnterpriseReady == "true" {
+		// Enable the channel export plugin by default
+		s.PluginStates["com.mattermost.plugin-channel-export"] = &PluginState{Enable: true}
+	}
+
 	if s.EnableMarketplace == nil {
 		s.EnableMarketplace = NewBool(PLUGIN_SETTINGS_DEFAULT_ENABLE_MARKETPLACE)
 	}