Fix benchmark test case - storage.challenge_response

[din-mukhammed]

Fixes

• Fixed storage.challenge_response by adding missing field initialization in mock challenge generation for benchmarks

Changes

Need to be mentioned in CHANGELOG.md?

Tests

Tasks to complete before merging PR:

• Ensure system tests are passing. If not Run them manually to check for any regressions 📋
• Do any new system tests need added to test this change? do any existing system tests need updated? If so create a PR at 0chain/system_test
• Merge your system tests PR to master AFTER merging this PR

Associated PRs (Link as appropriate):

• blobber:
• gosdk:
• system_test:
• zboxcli:
• zwalletcli:
• Other: ...

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (sprint-1.11@d377fdc). Click here to learn what that means.
The diff coverage is n/a.

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

@@              Coverage Diff               @@
##             sprint-1.11    #2836   +/-   ##
==============================================
  Coverage               ?   28.58%           
==============================================
  Files                  ?      392           
  Lines                  ?    66051           
  Branches               ?        0           
==============================================
  Hits                   ?    18879           
  Misses                 ?    44898           
  Partials               ?     2274           

Flag	Coverage Δ
Unit-Tests	28.58% <0.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

[dabasov]

lgtm