Sorter metrics is missing in release-5.1 branch

### What did you do?

Sorter metrics is missing in release-5.1 branch

See https://github.com/pingcap/tiflow/commit/800276f997620b7b29431b26c532ca036a3abaa3#diff-93bfb4fe4c4b1bef3f340e037a354f9f7898356abbdf129d9e512b32efdfb6ebL41

### What did you expect to see?

_No response_

### What did you see instead?

No sorter metrics

### Versions of the cluster

TiCDC version (execute `cdc version`):

```console
v5.1.4
```

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Sorter metrics is missing in release-5.1 branch #5690

What did you do?

What did you expect to see?

What did you see instead?

Versions of the cluster

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