fix: remove underscore from builtin_time_grains label

[cnabro]

SUMMARY

• remove underscore from builtin_time_grains label
• 

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[michael-s-molina]

Thanks for the fix @cnabro!

[codecov]

Codecov Report

Merging #24567 (0f4ac3c) into master (ba3bdc0) will increase coverage by 0.00%.
The diff coverage is 80.60%.

❗ Current head 0f4ac3c differs from pull request most recent head 0e086fb. Consider uploading reports for the commit 0e086fb to get more accurate results

@@           Coverage Diff            @@
##           master   #24567    +/-   ##
========================================
  Coverage   69.06%   69.07%            
========================================
  Files        1901     1906     +5     
  Lines       74019    74159   +140     
  Branches     8116     8161    +45     
========================================
+ Hits        51121    51223   +102     
- Misses      20787    20817    +30     
- Partials     2111     2119     +8     

Flag	Coverage Δ
hive	53.93% <68.14%> (+0.03%)	⬆️
mysql	?
postgres	79.47% <85.84%> (-0.03%)	⬇️
presto	53.83% <68.14%> (+0.03%)	⬆️
python	83.44% <89.38%> (-0.05%)	⬇️
sqlite	78.04% <80.53%> (+0.03%)	⬆️
unit	54.69% <62.83%> (+0.03%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...et-ui-chart-controls/src/components/labelUtils.tsx	100.00% <ø> (ø)
...ackages/superset-ui-chart-controls/src/fixtures.ts	100.00% <ø> (ø)
...d/packages/superset-ui-chart-controls/src/types.ts	100.00% <ø> (ø)
.../superset-ui-core/src/models/ExtensibleFunction.ts	100.00% <ø> (ø)
...ges/superset-ui-core/src/query/types/Datasource.ts	100.00% <ø> (ø)
...ackages/superset-ui-core/src/query/types/Metric.ts	100.00% <ø> (ø)
...rts/src/BigNumber/BigNumberTotal/transformProps.ts	0.00% <0.00%> (ø)
.../plugins/plugin-chart-echarts/src/BoxPlot/index.ts	50.00% <ø> (ø)
...d/plugins/plugin-chart-echarts/src/Funnel/index.ts	50.00% <ø> (ø)
...nd/plugins/plugin-chart-echarts/src/Gauge/index.ts	50.00% <ø> (ø)
... and 88 more

... and 3 files with indirect coverage changes

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