Remove duplicate program element in POM

[anguillanneuf]

Fixes #6107

[codecov]

Codecov Report

Merging #6108 into master will increase coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #6108      +/-   ##
============================================
+ Coverage     47.38%   47.38%   +<.01%     
+ Complexity    27197    27182      -15     
============================================
  Files          2523     2523              
  Lines        274599   274599              
  Branches      31378    31383       +5     
============================================
+ Hits         130117   130123       +6     
+ Misses       134869   134863       -6     
  Partials       9613     9613

Impacted Files	Coverage Δ	Complexity Δ
.../cloud/datastore/testing/LocalDatastoreHelper.java	85.07% <0%> (+4.47%)	17% <0%> (ø)	⬇️
.../java/com/google/cloud/testing/CommandWrapper.java	96.96% <0%> (+9.09%)	13% <0%> (ø)	⬇️

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