Reduce batch size for userList Action

[itsarijitray]

Reducing batch size to mitigate timeout issues.

JIRA: https://segment.atlassian.net/browse/STRATCONN-5566

Testing

Include any additional information about the testing you have completed to ensure your changes behave as expected. For a speedy review, please check any of the tasks you completed below during your testing.

• [ ] Added unit tests for new functionality
• [ ] Tested end-to-end using the local server
• [ ] [If destination is already live] Tested for backward compatibility of destination. Note: New required fields are a breaking change.
• [ ] [Segmenters] Tested in the staging environment
• [ ] [Segmenters] [If applicable for this change] Tested for regression with Hadron.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 77.96%. Comparing base (61eb683) to head (6052138). Report is 198 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2820      +/-   ##
==========================================
- Coverage   78.54%   77.96%   -0.59%     
==========================================
  Files        1095     1042      -53     
  Lines       21775    19007    -2768     
  Branches     4467     3704     -763     
==========================================
- Hits        17104    14818    -2286     
+ Misses       3362     2886     -476     
+ Partials     1309     1303       -6     

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