Rename json to json-flat in SqlJetTest

[srknzl]

hazelcast/hazelcast#19318

[codecov]

Codecov Report

Merging #1025 (7ee95b9) into master (41ba760) will decrease coverage by 0.22%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1025      +/-   ##
==========================================
- Coverage   92.53%   92.31%   -0.23%     
==========================================
  Files         432      432              
  Lines       16730    16730              
  Branches     1037     1037              
==========================================
- Hits        15481    15444      -37     
- Misses        982     1018      +36     
- Partials      267      268       +1     

Impacted Files	Coverage Δ
src/network/ConnectionManager.ts	81.12% <0.00%> (-5.09%)	⬇️
src/config/ConfigBuilder.ts	93.95% <0.00%> (-2.85%)	⬇️
src/core/HazelcastError.ts	65.36% <0.00%> (-1.12%)	⬇️
src/protocol/ErrorFactory.ts	64.96% <0.00%> (-0.73%)	⬇️
src/invocation/ClusterService.ts	93.61% <0.00%> (-0.71%)	⬇️
src/util/Util.ts	87.74% <0.00%> (ø)
src/proxy/MultiMapProxy.ts	97.71% <0.00%> (+0.57%)	⬆️
src/nearcache/RepairingTask.ts	92.64% <0.00%> (+2.94%)	⬆️

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