[Hactoberfest] Limit the number of retries on concurrency modification exceptions

**Situation**
Currently on concurrency modification exceptions the sync retries with no limit until there is no error. See:
https://github.com/commercetools/commercetools-sync-java/blob/7cacc37ef8a1412f9bf300ba08000c108db81b4f/src/main/java/com/commercetools/sync/commons/BaseSync.java#L115-L124

**Complication**
It causes unnecessary api calls if the platform returns 409 - ConcurrentModificationException for the requests.

**Resolution**
Limit the number of retries on concurrency modification exceptions.

从 src/main/java/com/commercetools/sync/commons/BaseSync.java 的第 115-124 行开始，这里并发修改异常目前会触发同步重试。跟踪该重试路径，并确定应如何应用重试次数限制；完成的标准是请求在达到配置的限制后停止重试，而不是一直持续到成功。

由索引模型根据 Issue 内容生成。