fix: Remove 'Stream' stacked style option for Bar charts

[abhinav-1305]

SUMMARY

Ensures the 'Stream' option is not available for Bar charts in the Stacked Style control.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

Steps:

1. Create or edit an ECharts Area chart.
2. Set "Stacked Style" to "Stream".
3. Change the chart type to ECharts Bar.
4. Open the "Stacked Style" dropdown.

Expected: "Stream" is not present - only "None" and "Stack" are available.

ADDITIONAL INFORMATION

• Has associated issue: resolves Remove the Stream Style Option for Bar Charts #33820
• 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

[korbit-ai]

I've completed my review and didn't find any issues.

Files scanned

​

File Path	Reviewed
superset-frontend/plugins/plugin-chart-echarts/src/Timeseries/types.ts	✅
superset-frontend/plugins/plugin-chart-echarts/src/constants.ts	✅
superset-frontend/plugins/plugin-chart-echarts/src/Timeseries/Regular/Bar/controlPanel.tsx	✅
superset-frontend/plugins/plugin-chart-echarts/src/Timeseries/transformProps.ts	✅

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[github-actions]

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[sadpandajoe]

@abhinav-1305 what happens to those who are using the stream option for bar charts? Won't this break for them or is this handled gracefully?