xds: use Cluster_AUTO DnsLookupFamily

[zirain]

fixes: #4605

[zirain]

test passed on #4690

[codecov]

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 ⚠️

Additional details and impacted files

@@            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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[arkodg]

thanks !