Hotfix the NPE in ProductSync Benchmark Test for SDK-v2

[leungkinghin-ct]

Description
When we going to release new version, NPE is found when saving the benchmarks result for Product Sync with SDK-v2
The corresponding build failure :
https://github.com/commercetools/commercetools-sync-java/actions/runs/3629611330/jobs/6122914828

Cause

• The benchmark result type for ProductSync with SDK-v2 is not yet defined in BenchmarkUtils.java

The NPE fix has been tested in CI build successfully when saving benchmark result.
https://github.com/commercetools/commercetools-sync-java/actions/runs/3630913001/jobs/6124846629

[codecov-commenter]

Codecov Report

Merging #874 (f48f348) into master (42ea44c) will not change coverage.
The diff coverage is n/a.

❗ Current head f48f348 differs from pull request most recent head 2a35a57. Consider uploading reports for the commit 2a35a57 to get more accurate results

@@            Coverage Diff            @@
##             master     #874   +/-   ##
=========================================
  Coverage     99.14%   99.14%           
  Complexity     2669     2669           
=========================================
  Files           225      225           
  Lines          7156     7156           
  Branches        440      440           
=========================================
  Hits           7095     7095           
  Misses           32       32           
  Partials         29       29           

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