ValueSet cleanup

[jamesagnew]

Fixes #4206

This PR:

• Fixes the issue above
• Adds more resiliency to HAPI FHIR Batch2 processing (bringing it more in line with how this works in Smile)
• Removes a whole bunch of version-specific JPA code for CodeSystem/ValueSet operations, replacing that with a single version independent codebase

[codecov]

Codecov Report

Base: 81.00% // Head: 81.10% // Increases project coverage by +0.10% 🎉

Coverage data is based on head (4a43b69) compared to base (02944ba).
Patch has no changes to coverable lines.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #4227      +/-   ##
============================================
+ Coverage     81.00%   81.10%   +0.10%     
+ Complexity    23466    23452      -14     
============================================
  Files          1446     1438       -8     
  Lines         86175    86073     -102     
  Branches      11798    11748      -50     
============================================
+ Hits          69809    69813       +4     
+ Misses        11087    11022      -65     
+ Partials       5279     5238      -41     

Impacted Files	Coverage Δ
...ir/jpa/provider/r4/BaseResourceProviderR4Test.java	0.00% <0.00%> (-95.32%)	⬇️
...uhn/fhir/jpa/term/config/TermCodeSystemConfig.java	75.00% <0.00%> (-25.00%)	⬇️
...bscription/channel/impl/LinkedBlockingChannel.java	72.72% <0.00%> (-17.28%)	⬇️
ca/uhn/fhir/jpa/test/config/TestJPAConfig.java	87.50% <0.00%> (-12.50%)	⬇️
ca/uhn/fhir/jpa/provider/BaseJpaProvider.java	52.54% <0.00%> (-7.81%)	⬇️
ca/uhn/fhir/util/ThreadPoolUtil.java	93.33% <0.00%> (-6.67%)	⬇️
...or/TransactionConcurrencySemaphoreInterceptor.java	80.59% <0.00%> (-5.98%)	⬇️
...terceptor/SubscriptionSubmitInterceptorLoader.java	94.44% <0.00%> (-5.56%)	⬇️
ca/uhn/fhir/jpa/util/MemoryCacheService.java	85.10% <0.00%> (-3.20%)	⬇️
.../interceptor/SearchParamValidatingInterceptor.java	85.84% <0.00%> (-1.32%)	⬇️
... and 87 more

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