Deprecate Distroless methods in jib-core

[chanseokoh]

No description provided.

[codecov]

Codecov Report

Merging #3123 (bf4d93a) into master (5421070) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #3123      +/-   ##
============================================
+ Coverage     71.13%   71.14%   +0.01%     
  Complexity     2316     2316              
============================================
  Files           278      278              
  Lines          9790     9790              
  Branches        991      991              
============================================
+ Hits           6964     6965       +1     
+ Misses         2481     2479       -2     
- Partials        345      346       +1     

Impacted Files	Coverage Δ	Complexity Δ
...com/google/cloud/tools/jib/api/ImageReference.java	82.69% <ø> (ø)	58.00 <0.00> (ø)
...ogle/cloud/tools/jib/api/JavaContainerBuilder.java	82.17% <100.00%> (-0.50%)	53.00 <0.00> (-1.00)
...b/plugins/common/PluginConfigurationProcessor.java	63.87% <100.00%> (ø)	65.00 <0.00> (ø)
...le/cloud/tools/jib/configuration/BuildContext.java	82.89% <0.00%> (+0.65%)	18.00% <0.00%> (ø%)
.../main/java/com/google/cloud/tools/jib/api/Jib.java	18.18% <0.00%> (+9.09%)	2.00% <0.00%> (+1.00%)

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