MM-54640 Add API to get multiple emojis by name at once (#24651)

* MM-54640 Add API to get multiple emojis by name at once

* Fix status code when too many names are requested

* Address feedback

* Update unit tests

* Fix styling

* Fix more styling

* Fix mismatched i18n id

server/channels/testlib/helper.go

@@ -61,6 +61,7 @@ func NewMainHelperWithOptions(options *HelperOptions) *MainHelper {
 	// Unset environment variables commonly set for development that interfere with tests.
 	os.Unsetenv("MM_SERVICESETTINGS_SITEURL")
 	os.Unsetenv("MM_SERVICESETTINGS_LISTENADDRESS")
+	os.Unsetenv("MM_SERVICESETTINGS_CONNECTIONSECURITY")
 	os.Unsetenv("MM_SERVICESETTINGS_ENABLEDEVELOPER")
 
 	var mainHelper MainHelper