fix: cleanup information in logs (#10634)

# Which Problems Are Solved

I noticed some outdated / misleading logs when starting zitadel:
- The `init-projections` were no longer in beta for a long time.
- The LRU auth request cache is disabled by default, which results in
the following message, which has caused confusion by customers:
```level=info msg="auth request cache disabled" error="must provide a positive size"```

# How the Problems Are Solved

- Removed the beta info
- Disable cache initialization if possible

# Additional Changes

None

# Additional Context

- noticed internally
- backport to v4.x

(cherry picked from commit a1ad87387d)

internal/auth_request/repository/cache/cache.go

@@ -27,6 +27,9 @@ func Start(dbClient *database.DB, amountOfCachedAuthRequests uint16) *AuthReques
 	cache := &AuthRequestCache{
 		client: dbClient,
 	}
+	if amountOfCachedAuthRequests == 0 {
+		return cache
+	}
 	idCache, err := lru.New[string, *domain.AuthRequest](int(amountOfCachedAuthRequests))
 	logging.OnError(err).Info("auth request cache disabled")
 	if err == nil {