fix: remove duplicate metric from bullet chart

[villebro]

CATEGORY

Choose one

• Bug Fix
• Enhancement (new features, refinement)
• Refactor
• Add tests
• Build / Development Environment
• Documentation

SUMMARY

In the Bullet Chart control panel, metric is defined twice, causing a weird user experience and duplicated metrics in the viz request payload.

BEFORE

AFTER

TEST PLAN

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

REVIEWERS

[codecov-io]

Codecov Report

Merging #9274 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #9274   +/-   ##
======================================
  Coverage    58.9%   58.9%           
======================================
  Files         373     373           
  Lines       12026   12026           
  Branches     2953    2953           
======================================
  Hits         7084    7084           
  Misses       4763    4763           
  Partials      179     179

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