[Logs UI] Correct logs anomalies i18n expression (#185660)

## 📓 Summary

Closes #184663 

The expression used to display selection modes/plurals was the
following:
```
{includeType, select, 
    includeAll {All datasets} 
    includeSome {{includedDatasetCount, plural, 
        one {# dataset} 
        other {# datasets}
    }}
}
```

Per [formatting
specification](https://formatjs.io/docs/core-concepts/icu-syntax/#select-format),
`select` expressions require a `other` and will throw an error if
`select` is used without `other` (`MISSING_OTHER_CLAUSE` error).

Adding the `other` clause to the expression as follows should fix it:
```
{includeType, select, 
    includeAll {All datasets} 
    includeSome {{includedDatasetCount, plural, 
        one {# dataset} 
        other {# datasets}
    }}
    other {No dataset available}
}
```


https://github.com/elastic/kibana/assets/34506779/248c4549-b828-4e83-a947-6374f5f27ddf

Co-authored-by: Marco Antonio Ghiani <[email protected]>

x-pack/plugins/observability_solution/infra/public/components/logging/log_analysis_setup/initial_configuration_step/index_setup_dataset_filter.tsx

@@ -68,7 +68,7 @@ export const IndexSetupDatasetFilter: React.FC<{
     >
       <FormattedMessage
         id="xpack.infra.analysisSetup.indexDatasetFilterIncludeAllButtonLabel"
-        defaultMessage="{includeType, select, includeAll {All datasets} other {{includedDatasetCount, plural, one {# dataset} other {# datasets}}}}"
+        defaultMessage="{includeType, select, includeAll {All datasets} includeSome {{includedDatasetCount, plural, one {# dataset} other {# datasets}}} other {No dataset available}}"
         values={{
           includeType: datasetFilter.type,
           includedDatasetCount: