Publish test jars during snapshot build

[michaelabuckley]

Our snapshot build didn't publish test jars.

Closes #3161

[codecov]

Codecov Report

Merging #3162 (5eca894) into master (2e6fb10) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #3162      +/-   ##
============================================
- Coverage     82.77%   82.76%   -0.01%     
- Complexity    20065    20067       +2     
============================================
  Files          1346     1346              
  Lines         72235    72235              
  Branches      10886    10886              
============================================
- Hits          59790    59788       -2     
- Misses         8266     8271       +5     
+ Partials       4179     4176       -3     

Impacted Files	Coverage Δ
...n/fhir/jpa/config/HapiFhirHibernateJpaDialect.java	75.00% <0.00%> (-3.13%)	⬇️
...java/ca/uhn/fhir/jpa/dao/TransactionProcessor.java	91.97% <0.00%> (-0.54%)	⬇️
.../ca/uhn/fhir/jpa/dao/BaseTransactionProcessor.java	87.92% <0.00%> (-0.24%)	⬇️
...or/TransactionConcurrencySemaphoreInterceptor.java	85.29% <0.00%> (+1.47%)	⬆️
...r/UserRequestRetryVersionConflictsInterceptor.java	87.50% <0.00%> (+4.16%)	⬆️

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