[MM-61140] Allow plugins to add Support Packet data without UI elements (#28833)

Co-authored-by: Ibrahim Serdar Acikgoz <serdaracikgoz86@gmail.com>

server/channels/app/file.go

@@ -1039,7 +1039,7 @@ func (a *App) DoUploadFileExpectModification(c request.CTX, now time.Time, rawTe
 
 	var rejectionError *model.AppError
 	pluginContext := pluginContext(c)
-	a.ch.RunMultiHook(func(hooks plugin.Hooks) bool {
+	a.ch.RunMultiHook(func(hooks plugin.Hooks, _ *model.Manifest) bool {
 		var newBytes bytes.Buffer
 		replacementInfo, rejectionReason := hooks.FileWillBeUploaded(pluginContext, info, bytes.NewReader(data), &newBytes)
 		if rejectionReason != "" {