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

services/telemetry/telemetry.go

@@ -1282,6 +1282,7 @@ func (ts *TelemetryService) trackPluginConfig(cfg *model.Config, marketplaceURL
 		"com.mattermost.custom-attributes",
 		"com.mattermost.mscalendar",
 		"com.mattermost.nps",
+		"com.mattermost.plugin-channel-export",
 		"com.mattermost.plugin-incident-management",
 		"com.mattermost.plugin-todo",
 		"com.mattermost.webex",