Unredact `failed to close SST sink: ‹×›`

**Is your feature request related to a problem? Please describe.**

Request to unredact the following log:

```
failed to close SST sink: ‹×›
```

This shouldn't possibly contain any PII that would need to be redacted, although we should make sure of that before unredacting.

Here is another iteration of this log that doesn't get redacted:

```
failed to flush SST sink: cannot call Finish on a closed writer
```

**Describe the solution you'd like**

Unredact this log line.

Jira issue: CRDB-41497

Epic CRDB-39822