yaml encoders should be flushed.

[gsquared94]

From doc: The Encoder should be closed after use to flush all data to w.

[codecov]

Codecov Report

Merging #5196 (08c418c) into master (35214eb) will increase coverage by 0.00%.
The diff coverage is 0.00%.

@@           Coverage Diff           @@
##           master    #5196   +/-   ##
=======================================
  Coverage   71.82%   71.83%           
=======================================
  Files         387      387           
  Lines       13928    13932    +4     
=======================================
+ Hits        10004    10008    +4     
  Misses       3190     3190           
  Partials      734      734           

Impacted Files	Coverage Δ
pkg/skaffold/yaml/yaml.go	54.83% <0.00%> (-8.13%)	⬇️
pkg/skaffold/util/tar.go	56.00% <0.00%> (+5.33%)	⬆️

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