Add CHANGELOG and integration tests for extra directories filtering

[chanseokoh]

For #2564 and #3164.

[codecov]

Codecov Report

Merging #3176 (9fb2f85) into master (b286cca) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master    #3176   +/-   ##
=========================================
  Coverage     71.18%   71.18%           
  Complexity     2331     2331           
=========================================
  Files           279      279           
  Lines          9846     9846           
  Branches        990      990           
=========================================
  Hits           7009     7009           
  Misses         2491     2491           
  Partials        346      346           

Impacted Files	Coverage Δ	Complexity Δ
...jib/plugins/common/JavaContainerBuilderHelper.java	95.31% <100.00%> (ø)	21.00 <1.00> (ø)

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[mpeddada1]

Could we add a test for maven as well?

[chanseokoh]

Added a Maven integration test too.

I also realized a minor issue with the filtering. Will fix it in a follow-up PR.