Integration test improvements

[norrisjeremy]

• Actually execute Maven Invoker verification scripts
• Verify reproducible build timestamps

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.72%. Comparing base (92fee05) to head (5cf6499).
Report is 104 commits behind head on master.

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #745      +/-   ##
============================================
+ Coverage     71.03%   71.72%   +0.68%     
- Complexity       96       98       +2     
============================================
  Files             7        7              
  Lines           580      587       +7     
  Branches         75       76       +1     
============================================
+ Hits            412      421       +9     
+ Misses          121      120       -1     
+ Partials         47       46       -1     

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[tcurdt]

Thanks!