### What changes were proposed in this pull request?
Remove the code for app top disk usage both in master and worker end.
Prefer to use below prometheus expr to figure out the top app usages.
```
topk(50, sum by (applicationId) (metrics_diskBytesWritten_Value{role="worker", applicationId!=""}))
```
### Why are the changes needed?
To address comments: https://github.com/apache/celeborn/pull/2947#issuecomment-2499564978
> Due to the application dimension resource consumption, this feature should be included in the deprecated features. Maybe you can remove the codes for application top disk usage.
### Does this PR introduce _any_ user-facing change?
Yes, remove the app top disk usage api.
### How was this patch tested?
GA.
Closes#2949 from turboFei/remove_app_top_usage.
Authored-by: Wang, Fei <fwang12@ebay.com>
Signed-off-by: mingji <fengmingxiao.fmx@alibaba-inc.com>
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