Use `TenantAwareCache` for the entity skip cache in FioriRecommendationHandler

[lisajulia]

The FioriRecommendationHandler currently manages its own Caffeine cache keyed by <tenantId>:<entityName> and manually evicts entries in invalidateTenant. Replace by com.sap.cds.services.utils.TenantAwareCache, which handles tenant-scoped invalidation natively, and then remove the manual eviction logic.

[github-actions]

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