Wrap checkIsResourcesReady with useMemo to optimize rendering

[Copilot]

Summary

Addresses review feedback on #7926 to memoize checkIsResourcesReady in useModernI18n hook.

The function was being called on every render. Now wrapped with useMemo with currentLanguage and i18nInstance as dependencies:

const isResourcesReady = useMemo(() => {
  // ... resource check logic
}, [currentLanguage, i18nInstance]);

Related Links

• Original PR: feat: i18n plugin support merge custom plugin config && add isResouecesReady state #7926
• Review feedback: feat: i18n plugin support merge custom plugin config && add isResouecesReady state #7926 (comment)

Checklist

• I have added changeset via pnpm run change.
• I have updated the documentation.
• I have added tests to cover my changes.

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