[MM-31360] downgrade error logs which doesn't break the flow (#16612)

* downgrade error logs which doesn't break the flow

* reflect revivew comments

services/imageproxy/local.go

@@ -47,7 +47,7 @@ func makeLocalBackend(proxy *ImageProxy) *LocalBackend {
 	if proxy.Logger != nil {
 		logger, err := proxy.Logger.StdLogAt(mlog.LevelDebug, mlog.String("image_proxy", "local"))
 		if err != nil {
-			mlog.Error("Failed to initialize logger for image proxy", mlog.Err(err))
+			mlog.Warn("Failed to initialize logger for image proxy", mlog.Err(err))
 		}
 
 		impl.Logger = logger
@@ -55,7 +55,7 @@ func makeLocalBackend(proxy *ImageProxy) *LocalBackend {
 
 	baseURL, err := url.Parse(*proxy.ConfigService.Config().ServiceSettings.SiteURL)
 	if err != nil {
-		mlog.Error("Failed to set base URL for image proxy. Relative image links may not work.", mlog.Err(err))
+		mlog.Warn("Failed to set base URL for image proxy. Relative image links may not work.", mlog.Err(err))
 	} else {
 		impl.DefaultBaseURL = baseURL
 	}
@@ -92,7 +92,7 @@ func (backend *LocalBackend) GetImage(w http.ResponseWriter, r *http.Request, im
 	req, err := http.NewRequest(http.MethodGet, "/"+imageURL, nil)
 	if err != nil {
 		// http.NewRequest should only return an error on an invalid URL
-		mlog.Error("Failed to create request for proxied image", mlog.String("url", imageURL), mlog.Err(err))
+		mlog.Debug("Failed to create request for proxied image", mlog.String("url", imageURL), mlog.Err(err))
 
 		w.WriteHeader(http.StatusBadRequest)
 		w.Write([]byte{})
@@ -101,7 +101,7 @@ func (backend *LocalBackend) GetImage(w http.ResponseWriter, r *http.Request, im
 
 	u, err := url.Parse(imageURL)
 	if err != nil {
-		mlog.Error("Failed to parse URL for proxied image", mlog.String("url", imageURL), mlog.Err(err))
+		mlog.Debug("Failed to parse URL for proxied image", mlog.String("url", imageURL), mlog.Err(err))
 		w.WriteHeader(http.StatusBadRequest)
 		w.Write([]byte{})
 		return