[Pagination] components page number is not formated according to i18n

**Describe the bug**
The pagination component does not use i18n formatting for page numbers.

**Impact and severity**
This is not a really big issue for users, but also a small change to improve pagination with large number of pages.

**Environment and versions**
- EUI version: v99.9

**To Reproduce**
cf. screenshot and snippet below (also active on the documentation page: https://eui.elastic.co/#/navigation/pagination )

**Expected behavior**
Use i18n formatted values for pages. https://github.com/elastic/eui/blob/main/packages/eui/src/components/pagination/pagination_button.tsx#L35

**Minimum reproducible sandbox**
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**Screenshots**