[MM-37772] Idiomatic naming (URL, URI, API) (#18128)

* s/Url/URL/g & s/Uri/URI/g

* s/Api/API/g

services/remotecluster/sendfile.go

@@ -98,7 +98,7 @@ func (rcs *Service) sendFileToRemote(timeout time.Duration, task sendFileTask) (
 	if err != nil {
 		return nil, fmt.Errorf("invalid siteURL while sending file to remote %s: %w", task.rc.RemoteId, err)
 	}
-	u.Path = path.Join(u.Path, model.ApiUrlSuffix, "remotecluster", "upload", task.us.Id)
+	u.Path = path.Join(u.Path, model.APIURLSuffix, "remotecluster", "upload", task.us.Id)
 
 	req, err := http.NewRequest("POST", u.String(), r)
 	if err != nil {

services/remotecluster/sendprofileImage.go

@@ -99,7 +99,7 @@ func (rcs *Service) sendProfileImageToRemote(timeout time.Duration, task sendPro
 	if err != nil {
 		return fmt.Errorf("invalid siteURL while sending file to remote %s: %w", task.rc.RemoteId, err)
 	}
-	u.Path = path.Join(u.Path, model.ApiUrlSuffix, "remotecluster", task.userID, "image")
+	u.Path = path.Join(u.Path, model.APIURLSuffix, "remotecluster", task.userID, "image")
 
 	body := &bytes.Buffer{}
 	writer := multipart.NewWriter(body)