Fix flaky time test

[Steve-Mcl]

closes #3874

Description

Add 500ms grace to the relative time test to avoid a rare (but frequent enough to waste our time) test bug.

Related Issue(s)

#3874

Checklist

• I have read the contribution guidelines

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.58%. Comparing base (c11abf5) to head (980c113).
Report is 3 commits behind head on main.

❗ Current head 980c113 differs from pull request most recent head 624fd34

Please upload reports for the commit 624fd34 to get more accurate results.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4021   +/-   ##
=======================================
  Coverage   78.57%   78.58%           
=======================================
  Files         284      284           
  Lines       12982    12979    -3     
  Branches     2891     2890    -1     
=======================================
- Hits        10201    10199    -2     
+ Misses       2781     2780    -1     

Flag	Coverage Δ
backend	78.58% <ø> (+<0.01%)	⬆️

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