feat: [PE-882] CGN new discounts count (#6607)

## Short description
Replaced badge label of "novità" with actual new discounts count. 

## List of changes proposed in this pull request
- change label

## How to test
- to test with dev-api-server you need
pagopa/io-dev-api-server#455
- login into the app
- go to carta giovani nazionale trough portafoglio (add the card if
necessary)
- go to discount list by pressing "scopri opportunià"
- press "by partner" tab
- check that the badges contain numbers instead of a fixed label
- press "by category" tab
- press on any category
- check that the badges contain numbers instead of a fixed label

---------

Co-authored-by: Emanuele Dall'Ara <[email protected]>

scripts/generate-api-models.sh

@@ -1,6 +1,6 @@
 #!/bin/bash
 
-IO_BACKEND_VERSION=v16.4.0-RELEASE
+IO_BACKEND_VERSION=v16.7.3-RELEASE
 # need to change after merge on io-services-metadata
 IO_SERVICES_METADATA_VERSION=1.0.55
 

ts/features/bonus/cgn/components/merchants/CgnMerchantsListView.tsx

@@ -23,7 +23,11 @@ export const CgnMerchantListViewRenderItem =
                 <View style={[IOStyles.rowSpaceBetween, IOStyles.alignCenter]}>
                   <Badge
                     variant="purple"
-                    text={I18n.t("bonus.cgn.merchantsList.news")}
+                    text={
+                      item.numberOfNewDiscounts
+                        ? item.numberOfNewDiscounts.toString()
+                        : I18n.t("bonus.cgn.merchantsList.news")
+                    }
                   />
                 </View>
               )}