Add Last contact app to onboarding v2 installable apps (#22433)

Adds the Last contact app to the list of installable apps shown in the
onboarding v2 install-apps step, alongside Call recorder and Enrichment.

Wired in both the frontend list (label + description) and the backend
reward/install allow-list so it can be selected, installed server-side,
and credited.

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packages/twenty-front/src/modules/onboarding/constants/OnboardingInstallableApps.ts

@@ -12,4 +12,9 @@ export const ONBOARDING_INSTALLABLE_APPS: OnboardingInstallableApp[] = [
     label: msg`Enrichment`,
     description: msg`Enrich your leads with People Data Labs`,
   },
+  {
+    universalIdentifier: '66a504cc-0a75-410e-a43f-cdeae1db1522',
+    label: msg`Last contact`,
+    description: msg`Get last contact date with relations`,
+  },
 ];