Adds the capability to retrieve a property field by name (#30859)

* Adds the capability to retrieve a property field by name

Allows to retrieve a property field by name and groupID. As the name
is only unique within the context of a group, and we can have multiple
fields with the same name in the store, for this method the groupID is
directly included in the query instead of being an optional field.

* Adds the targetID parameter to correctly filter fields

* Ensure the method only retrieves non-deleted fields

---------

Co-authored-by: Miguel de la Cruz <miguel@ctrlz.es>
Co-authored-by: Mattermost Build <build@mattermost.com>

server/channels/store/retrylayer/retrylayer.go

@@ -9190,6 +9190,27 @@ func (s *RetryLayerPropertyFieldStore) Get(groupID string, id string) (*model.Pr
 
 }
 
+func (s *RetryLayerPropertyFieldStore) GetFieldByName(groupID string, targetID string, name string) (*model.PropertyField, error) {
+
+	tries := 0
+	for {
+		result, err := s.PropertyFieldStore.GetFieldByName(groupID, targetID, name)
+		if err == nil {
+			return result, nil
+		}
+		if !isRepeatableError(err) {
+			return result, err
+		}
+		tries++
+		if tries >= 3 {
+			err = errors.Wrap(err, "giving up after 3 consecutive repeatable transaction failures")
+			return result, err
+		}
+		timepkg.Sleep(100 * timepkg.Millisecond)
+	}
+
+}
+
 func (s *RetryLayerPropertyFieldStore) GetMany(groupID string, ids []string) ([]*model.PropertyField, error) {
 
 	tries := 0