fix: update assertion in _metric_chart.js

[SuZhou-Joe]

Description

OS bump t-digest to 3.3 and it introduces an inconsistency in test _metric_chart.js. This PR is to make the assertion more flexible so that it can cover both the case of 2.x OS and 3.x OS.

Issues Resolved

Screenshot

Testing the changes

Changelog

• skip

Check List

• All tests pass
  • yarn test:jest
  • yarn test:jest_integration
• New functionality includes testing.
• New functionality has been documented.
• Update CHANGELOG.md
• Commits are signed per the DCO using --signoff

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.72%. Comparing base (4e21765) to head (e06d5b6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9391   +/-   ##
=======================================
  Coverage   61.71%   61.72%           
=======================================
  Files        3817     3817           
  Lines       91860    91860           
  Branches    14551    14551           
=======================================
+ Hits        56695    56697    +2     
+ Misses      31508    31507    -1     
+ Partials     3657     3656    -1     

Flag	Coverage Δ
Linux_1	29.00% <ø> (ø)
Linux_2	56.46% <ø> (ø)
Linux_3	39.20% <ø> (+<0.01%)	⬆️
Linux_4	28.90% <ø> (ø)
Windows_1	29.01% <ø> (ø)
Windows_2	56.41% <ø> (ø)
Windows_3	39.20% <ø> (ø)
Windows_4	28.90% <ø> (ø)

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[Flyingliuhub]

Thanks for checking this