default --nested to yaml output

[theganyo]

Fixes #1205

[codecov[bot]]

Codecov Report

Merging #1214 (23ce618) into main (1c8a972) will decrease coverage by 0.02%. The diff coverage is 57.14%.

@@            Coverage Diff             @@
##             main    #1214      +/-   ##
==========================================
- Coverage   71.87%   71.86%   -0.02%     
==========================================
  Files         146      146              
  Lines       12191    12197       +6     
==========================================
+ Hits         8762     8765       +3     
- Misses       2748     2749       +1     
- Partials      681      683       +2     

Impacted Files	Coverage Δ
cmd/registry/cmd/get/get.go	77.20% <57.14%> (-0.67%)	:arrow_down:

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