xds: use Cluster_AUTO DnsLookupFamily

[zirain]

fixes: https://github.com/envoyproxy/gateway/issues/4605

[zirain]

test passed on https://github.com/envoyproxy/gateway/pull/4690

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 11.11111% with 8 lines in your changes missing coverage. Please review.

Project coverage is 65.66%. Comparing base (86d750a) to head (5251bed). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/xds/translator/cluster.go	11.11%	7 Missing and 1 partial :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #4740 +/- ## ========================================== + Coverage 65.63% 65.66% +0.03% ========================================== Files 211 211 Lines 31996 32001 +5 ========================================== + Hits 21000 21013 +13 + Misses 9757 9752 -5 + Partials 1239 1236 -3 ```

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