Add delay & retry to flakey weight splits test

[pdabelf5]

Proposed changes

Add delay & retry to allow nginx to update

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.10%. Comparing base (46fcf92) to head (8daa542).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7324   +/-   ##
=======================================
  Coverage   53.10%   53.10%           
=======================================
  Files          89       89           
  Lines       21074    21074           
=======================================
  Hits        11192    11192           
  Misses       9419     9419           
  Partials      463      463           

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