Nebo15 / logger_json / 88a149b0aca3dd00ebd5d857d1e92626c8f5b5fc

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fix(google-cloud): `format_affected_user/1` with non-binary values (#161)

### 🐞 Problem  
The `google_cloud` formatter crashes when it receives a crash log where
the `user context` contains values that are not binaries (e.g.,
integers). This happens because the formatter uses the `<>` operator for
string concatenation, which raises an error when used with non-binary
types.

**Truncated example of a crashed log:**

```bash
2025-01-01T01:01:01.000000+00:00 error: FORMATTER CRASH: {string,<<"** (Postgrex.Error) ERROR 428...
```

### ✅ Solution  
This PR replaces the use of the `<>` operator with `Enum.join/2` when
formatting key-value pairs. This approach safely converts all values to
strings before concatenation, preventing crashes when values are not
binaries.

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