[Unified Field List] fix long single-word values (#172544)

## Summary

Fixes non-wrapping of a single word values:

![image](3a9acfed-15da-4e46-84fc-72f42acc8716)

It worked correctly for long values that are multi words, that's why I
didn't notice it.
<img width="437" alt="Screenshot 2023-12-05 at 10 03 51"
src="2713a65e-c3fb-4bbb-a6f5-49f6cc00ac11">

It was caused by last minute change in my
[PR](https://github.com/elastic/kibana/pull/171076) here: where I
swapped `word-break: break-word;` (deprecated) to `overflow-wrap:
break-word;` which is not equivalent. Changing the value to `anywhere`
solves it.

packages/kbn-unified-field-list/src/components/field_stats/field_top_values_bucket.tsx

@@ -87,7 +87,7 @@ const FieldTopValuesBucket: React.FC<FieldTopValuesBucketProps> = ({
             grow={true}
             data-test-subj={`${dataTestSubject}-topValues-formattedFieldValue`}
             css={css`
-              overflow-wrap: break-word;
+              overflow-wrap: anywhere;
             `}
           >
             {(formattedFieldValue?.length ?? 0) > 0 ? (