Fix batching of mdm-clear tasks

[IanMMarshall]

No description provided.

[IanMMarshall]

Found an issue in the $mdm-clear batch operation that appears to be similar to one recently fixed for reindexing as part of #3211.

[codecov]

Codecov Report

Merging #3295 (301519e) into master (55ad98d) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #3295      +/-   ##
============================================
- Coverage     82.82%   82.82%   -0.01%     
- Complexity    20377    20379       +2     
============================================
  Files          1366     1366              
  Lines         73172    73174       +2     
  Branches      11010    11011       +1     
============================================
+ Hits          60606    60607       +1     
- Misses         8346     8349       +3     
+ Partials       4220     4218       -2     

Impacted Files	Coverage Δ
.../ca/uhn/fhir/jpa/batch/mdm/job/MdmLinkDeleter.java	89.47% <100.00%> (ø)
...a/ca/uhn/fhir/jpa/dao/expunge/PartitionRunner.java	73.01% <100.00%> (+0.88%)	⬆️
...a/ca/uhn/fhir/rest/openapi/OpenApiInterceptor.java	86.39% <0.00%> (-0.40%)	⬇️
...or/TransactionConcurrencySemaphoreInterceptor.java	85.29% <0.00%> (+1.47%)	⬆️

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