Keep transaction cleanup independent of request cancellation

[mikaelweave]

Summary

Splits the SqlServerFhirDataStore failed-transaction cleanup token change out of #5553 for independent review.

Changes

• SqlServerFhirDataStore.cs: pass CancellationToken.None to MergeResourcesCommitTransactionAsync in the MergeInternalAsync single-transaction catch block.
• This prevents an already-cancelled request token from skipping server-side transaction failure marking.
• BundleHandler cancellation response mapping remains in Return 408 for cancelled bundle transaction cleanup #5553.

Testing

• dotnet build src\Microsoft.Health.Fhir.SqlServer\Microsoft.Health.Fhir.SqlServer.csproj --verbosity minimal
• git diff --check

Related

Split from #5553 for ADO Bug #188321.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.34%. Comparing base (b696902) to head (41f12fa).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5574      +/-   ##
==========================================
- Coverage   77.37%   77.34%   -0.03%     
==========================================
  Files         993      993              
  Lines       36418    36418              
  Branches     5518     5518              
==========================================
- Hits        28177    28169       -8     
- Misses       6880     6887       +7     
- Partials     1361     1362       +1     

see 10 files with indirect coverage changes

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