UIU-3312 provide itemToString to correctly serialize options

`MultiSelection` creates unique `key` attributes for its options with a
default function of
```
(option) => option ? option.label : ''
```
but the `label` attribute here is a `<FormattedMessage>, leading that
function to serialize all options as `[object Object]`. Since we know
the `value` attribute here is a unique string, we use that instead.

Refs UIU-3312

CHANGELOG.md

@@ -11,6 +11,7 @@
 * Update fee/fine actions column UX for accessibility. Refs UIU-3027.
 * Rename permission after BE changes. Refs UIU-3309.
 * Change import of `exportToCsv` from `stripes-util` to `stripes-components`. Refs UIU-3202.
+* Provide `itemToString` to create unique `key` attributes. Refs UIU-3312.
 
 ## [11.0.10](https://github.com/folio-org/ui-users/tree/v11.0.10) (2025-01-10)
 [Full Changelog](https://github.com/folio-org/ui-users/compare/v11.0.9...v11.0.10)

src/components/EditSections/EditContactInfo/EditContactInfo.js

@@ -136,6 +136,7 @@ const EditContactInfo = ({
                 fullWidth
                 disabled={disabled}
                 filter={prefEmailCommFilterOptions}
+                itemToString={(option) => option.value}
               />
             </Col>
           </Row>